How much kinetic energy to kill a deer

As long as you make a good shot, that is. According to Easton, a 400 grain arrow traveling at the glacial speed of 170 feet-per-second has sufficient energy to harvest a mature deer. Heck, many kids bows can easily shoot such a light arrow faster than 170 fps, and I’ve seen such rigs do pass-throughs on deer!

How much kinetic energy to kill a deer. 0.111 slugs. If you know your arrow's weight (in grains) and your arrow's speed (Feet Per Second), then you can use our Kinetic Energy and Momentum calculator above to find out each! Simply move the sliders or enter the values in the blanks. And, if you really want to take a deep dive into the Kinetic Energy of arrows, check out what the ...

Imagine that much kinetic energy concentrated into an object the size of a bullet, or a pellet, or a super cool .50 caliber arrow. Now imagine 350 foot pounds in a bullet, or a pellet, or a super cool .50 caliber arrow, and then remember that many PCP's intended to hunt deer and other types of bigger game will exceed that number.

10 The diagram shows the path of a stone that is thrown from X and reaches its maximum height at Y. path of stone X6 The stone gains 10J of gravitational potential energy as it moves from X lo Y. The stone has 2.0J of kinetic energy at Y. Air resistance can be ignored. How much kinetic energy did the stone have immediately after it was thrown at X?Jun 25, 2006 ... What you have is a light 30-30 power level. You could use this load out to 110yd where your energy drops to 1,000 ft/lb, but not beyond. I ...Smaller calibers require great skill. When you increase the caliber size from .177 to .22, .25, .30, .357, .45 and upward, then the precision required for a humane kill decreases. There are some calibers that are very well suited for various types of game. The general rule in the airgun world has always been .177 for feathers and .22 for fur.500. Although the .44 Magnum offers a little less than half the punch of most popular deer rifles, it still provides enough energy to produce a clean kill on big game. When it comes to handgun rounds, it exceeds the muzzle energy supplied by others. It can also maintain over 500-foot pounds out to approximately 100 yards.Falling, mines, car bombs, trap doors, extreme pressure, slow squashing, and tearing apart all use kinetic energy to kill so they don't apply. Poisoned needles, drowning, burying, hanging, tying up, and rolling up in a carpet are practically impossible to inflict against a person of superhuman toughness and reflexes.Hunters aim to kill. In addition to being a Level 2 U.S. archery coach, Mark Beck is a hunter and an engineer with Plano Synergy who has experience in designing both arrows and crossbows. He makes no secret which side of the argument he's on. "I want more kinetic energy to drive that broadhead through," he said.

The company's 165-grain Trophy Copper .308 Win. travels 2700 feet per second (fps) at the muzzle and produces 2671 foot-pounds (ft.-lbs.) of energy. The 120-grain Trophy Copper 6.5 Creed, by contrast, travels 2875 fps at the muzzle but only produces 2200 ft.-lbs. of energy. These numbers change based on bullet weight and load construction ...A HITS score between 500 and 900 denotes that a cartridge/load is suitable for medium game (50 - 300 pounds). The .30-30 load above has a HITS score of 652, which verifies that this load is suitable for deer-sized game at 100 yards. The second index is the "Guns and Shooting Online Rifle Cartridge Killing Power Formula."Step 1. Given a hoop... The ball is launched with total initial energy Einitial = mgho. When it reaches the bottom of the hoops, it now has a potential ernergy of PE mghplat for m. How much kinetic energy must it have at that point? Omgho Omghplat form mgho mghplat form Omgho mghplat for m.Kinetic energy is energy in motion. A 150-grain bullet standing still has potential energy. Dropped, it has a bit of kinetic energy, and you’ll feel this should it land on your naked toe. Push this same bullet with about 50 grains of Hodgdon 4350 powder behind it, and you won’t want to feel it on your toe or anyplace else. It will be ...It does not take much to kill a deer, it does however require that that "not much" be put in the correct place. ~z _____ A scalpel can be just as effective as a broadsword ... Kinetic energy, momentum, sectional density and nose shape all wind up playing a roll, and it gets very difficult to make valid rules off the cuff. Even the complex ...

One foot pound equals about 1.36 joule, 0.32 calorie, or 0.0013 Btu. Not enough heat to significantly raise the emperature. We are not talking about 1 ft lb of energy, we are talking about 4800 ftbs. If most of that energy was transfered into thermal energy, it would blister your finger to touch the target or bullet.At least when these arrows hit the deer they have a decent and more lethal amount of momentum. Let’s review my advice: 6 grains of arrow weight per pound of draw weight for bows in the 70-lb. range. 8 grains of arrow weight per pound of draw weight for bows in the 60-lb. range. 10 grains of arrow weight per pound of draw weight for bows in ...Step 1. Course Home Homework 10 Problem 9.31 9 of 13 Review An air-track cart with mass m1 0.25 kg and initial speed vo 0.75 m/s collides with and sticks to a second cart that is at rest initially. PartA If the mass of the second cart is m2 0.49 kg, how much kinetic energy is lost as a result of the collision?A chronograph can be used to measure speed or can be obtained from the manufacturer. Once these figures are known, multi- ply velocity X velocity X total arrow weight in grains, and then divide that figure by 450,340 to obtain kinetic energy in foot-pounds. The weight of crossbow arrows is designated in grains.The effective range for a crossbow is the same as most compound bows: 40 yards. This is the distance over which the majority of bowhunters can repeatedly make a successful lethal shot. Much of this depends on accuracy. It's difficult to hit the kill zone the farther away the target is.

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"What is thought to be the minimum foot-pounds of energy required to dispatch anything from whitetail deer to moose humanely and ethically?" The most common figure thrown around when hunters discuss the energy required to ethically kill a whitetail is 1,000 ft.-lb.Mark the 8-inch kill zone on your target. Shoot at the kill zone from 20 yards with your 20-yard pin. Your first arrow should hit dead-center in the 8-inch zone, since your pin is sighted in for 20 yards. Now move forward 1 yard and shoot again. Keep moving 1 yard closer to the target with each shot.placed. 2500 ft/lbs is recommended for animals weighing 1500 pounds and 4000 ft/lbs + for. dangerous game for obvious reasons. The main thing is to use a bullet at or above it's designed velocity and energy so as to get the. best performance from it under ALL hunting conditions. So to sum it up if you are hunting deer.Feb 8, 2019 ... You have surely heard and may possibly believe that the killing power of a cartridge is represented by kinetic bullet energy.

A railroad car with a mass of 40,000 kg is going east at 3.0 m/s when it collides with a second car whose mass is 25,000 kg and is going east at 1.0 m/s on the same track. If the two cars couple together, how much kinetic energy was lost at the collision?5.0x10 to the fifth J, 7.3x10,1.8x10,3.1x10, 940 Jplease show the steps:)As I understand it, it assumes pretty much perfect headshot placement. 1) Gray squirrel/Fox Squirrel - 4.5fpe. 2) Eastern Cottontail/Swamp Rabbit - 4fpe. 3) Jack Rabbit White, Black, and Jack O' lope - 4.5fpe. 4) Raccoon/ Bandit - 9fpe.. if it's a big one, 10fpe. 5) Virginia Opossum/ County Rat - 10fpe.A 500 grain arrow moving at 260 fps has a kinetic energy of 75.04 ft-lbs and a momentum of .577 slugs*. A 700 grain arrow moving at 175 fps has a kinetic energy of 47.59 ft-lbs and a momentum of .544 slugs*. *The slug is a measurement of force defined as the mass that is accelerated by 1 ft/s 2 when a net force of one pound (lbf) is exerted on it.At the end of the day, the question of draw weight doesn't matter as much as it once did to bowhunters — but 40 pounds is still a good starting point. Lighter than that will work, too, so long as you know the constraints and make the proper adjustments to your equipment. Get your camo fix at the Realtree store.Physics questions and answers. During an ice show a 65.0 kg skater leaps into the air and is caught by an initially stationary 75.0 kg skater. (a) What is their final velocity in meters per second assuming negligible friction and that the 65.0-kg skater's original horizontal velocity was 4.00 m/s? 1.9 X m/s (b) How much kinetic energy is lost ...Kinetic windstream technology is an innovative form of renewable energy that harnesses the power of wind to generate electricity. It works by capturing the kinetic energy in wind a...Surely the massive energy of a 375 H&H, 458 Win. Mag., or 458 Lott will kill a deer instantly every time, right? Don't count on it. I've seen half-grown whitetails take a 50-caliber through the chest and run 25 yards before falling.Because there are so many factors at play, it’s hard to say with 100% certainty which arrow setups will penetrate a deer's shoulder every time. However, let's call out a few examples of modern-day arrow setups that are very likely to penetrate the scapula. Take the average male bowhunter shooting a roughly 70-pound bow, with about a 28 …By Bob Robb. When discussing the penetrating ability of a hunting arrow, the two most commonly referred to factors are kinetic energy and momentum. The term kinetic …With that in mind, most hunters would agree that the max effective range of a .243 for deer hunting will be anywhere from 200 to 400 yards. Other external factors will also come into play, from the wind, weather, and shooting position. You also have to consider the skill level of the shooter, so really the maximum effective range will vary from ...velocity x velocity x total arrow weight (in grains) divided by 450,240. How much do your arrows weigh in grains. How fast (in feet per second) are your arrows. to calculate your KE (kinetic Energy) Your KE = How much KE do you really need? If you're hunting deer, you don't need much at all. As long as you make a good shot, that is.What Is Kinetic Energy? Kinetic energy is the energy of mass in motion. The kinetic energy of an object is the energy it has because of its motion. In Newtonian (classical) mechanics, which ...

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“What is thought to be the minimum foot-pounds of energy required to dispatch anything from whitetail deer to moose humanely and ethically?” The most common figure thrown around when hunters discuss the energy required to ethically kill a whitetail is 1,000 ft.-lb.A commonly accepted threshold for the minimum amount of kinetic energy needed to kill an elk is 1500 ft-lbs. For whitetail deer, the minimum amount of kinetic energy is 1000 ft-lbs. We’ve all probably heard stories of hunters taking elk with a .243 Win.Naturally, the kinetic energy of an object at rest should be zero. Thus an object's kinetic energy is defined mathematically by the following equation…. K = ½mv 2. Thomas Young (1773-1829) derived a similar formula in 1807, although he neglected to add the ½ to the front and he didn't use the words mass and weight with the same precision we do nowadays.The movement of energy and matter in ecosystems. Energy flows through an ecosystem, while matter cycles within it. To understand why this is the case let's take a closer look at how different life processes drive the movement of energy and matter in ecosystems. Energy enters an ecosystem when producers carry out photosynthesis, capturing ...#1 · Jan 29, 2011. I just wanna know peoples opinions on recommended kinetic energy for elk. Ive got some shoulder damage and cant pull 70lb bows anymore. Any ideas? Like. …The four major factors that influence penetration are Kinetic Energy, Broadhead Type, Friction, and ... a 400 grain arrow traveling at the glacial speed of 170 feet-per-second has sufficient energy to harvest a mature deer. Heck, many kids bows can easily shoot such a light arrow faster than 170 fps, and I’ve seen such rigs do pass-throughs ...Kinetic energy is one of several factors that can impact how far an arrow penetrates into it's intended target, foam or flesh. The formula for calculating kinetic energy reveals that there are two primary variables – mass and velocity, or in archery terms – arrow weight and arrow speed.In hunting, how much damage a bullet does is more important than its toughness. A bullet that sheds weight and deforms chaotically causes more damage. Conventional mono-metal bullets dump about 50% of their energy in the first 8 inches. Traditional cup-and-core and lead core dump about 80%. Somewhere along the way, the notion that you can ...A chronograph can be used to measure speed or can be obtained from the manufacturer. Once these figures are known, multi- ply velocity X velocity X total arrow weight in grains, and then divide that figure by 450,340 to obtain kinetic energy in foot-pounds. The weight of crossbow arrows is designated in grains.

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All projectile weapons function by transferring kinetic energy from a weapon into the body of an individual. Ballistics data indicate that denser objects and faster projectile speeds increase the force of impact. 14 KIPs have a wide range of variables that can impact injury patterns and severity, including the material composition, ...Greater speed increases kinetic energy, which can improve penetration and lead to improved recovery rates on game. That said, a well-placed arrow from a 300-fps bow will kill a critter just as ...Minimum remaining kinetic energy at impact: 800 ft. lbs. If a cartridge fails to meet any of these minimum requirements it should not be considered an adequate deer cartridge. Based on this, the .25-35 (introduced in 1895) would be about the minimum acceptable 100 yard deer cartridge that is still factory loaded today.Aug 10, 2021 ... When I hear someone talking about arrow speeds and what not, 9 times out of 10 they mention how much kinetic energy they are getting. Kinetic ...I've always suggested using Energy (lbs) thats (4 x the animals weight). Example a 200 pound deer needs 800ft.lbs. energy. deer: 700-1400lbs. "Energy". Elk: 1400-2000lbs. of course there is lots of varibles but this is a good rule of thumb.... “Everyone has a plan until they are punched in the face", Mike Tyson. Like. Fury90flier. 20950 posts · Joined 2012. #3 · Oct 27, 2012. very little to kill a deer- under …Homework Statement An object, with mass 79 kg and speed 23 m/s relative to an observer, explodes into two pieces, one 5 times as massive as the other; the explosion takes place in deep space. The less massive piece stops relative to the observer. How much kinetic energy is added to the system...One other thing about comparing rifle cartridges to pistol cartridges, as far as ranges go, rifles usually carry way too much energy for their own good-what I mean by this is a .30-06 or a .300win mag can easily kill a deer at 1000yrds, but there are about 6 guys (non-military) in the world that could make that shot under hunting conditions ... ….

As bowhunters, we have one goal. A well executed shot & perfectly placed arrow providing a clean passthrough. I want you to read that last line once more and...Science. Physics. Physics questions and answers. During an ice skating performance, an initially motionless 88.5-kg clown throws a fake barbell away horizontally. The clown's ice skates allow her to recoil frictionlessly. If the clown recoils with a speed of 0.495 m/s and the barbell is thrown with a speed of 7.5 m/s, what is the mass, in ...Science. Physics. Physics questions and answers. During an ice skating performance, an initially motionless 88.5-kg clown throws a fake barbell away horizontally. The clown's ice skates allow her to recoil frictionlessly. If the clown recoils with a speed of 0.495 m/s and the barbell is thrown with a speed of 7.5 m/s, what is the mass, in ...Calgary, Alberta, Canada. Jul 19, 2001. #1. Anyone have any thoughts on the amount of terminal energy required to cleanly kill game? I looked in a hunter-ed book and it lists the following as suggested minimums. Deer, Antelope, Sheep 900 ft/lb. Elk, Small Bear 1500 ft/lb.to kill an animal you're looking for kinetic energy. I think the rule of thumb is 1000 ft-lbs of energy should be the minimum. So a 130 gr .277 caliber bullet with a muzzle velocity of 3000 fps has about 2600 ft-lbs of kE. A 170 gr bullet out of a 30-30 Win with a muzzle velocity of 2200 fps has about 1830 ft-lbs. Both are enough to kill a deer.When hunting for big or small game, we need to look at the pellet's weight multiplied by the Velocity Squared, divided by 450395. Conventional wisdom has held that 1,000lbs foot-pounds of energy are required to kill a deer. However, users of the Umarex Hammer are easily killing big game as large as cape buffalo with a 550-grain bullet ...Mar 3, 2019. Messages. 4. My total arrow weight with the 125gr. Broadhead weighs 428 gr. Our shots have been perfect broadside shots, but only punching through one side and not both. I have looking at the Full Metal Jacket 400 @ 10.2 GPI. Which would bring m up to 465g or go to to FMJ 340 @ 11.3GPI and be at 497gr.Rifle rounds on the other hand have more kill (kinetic) power. This is possible even at long ranges if you have the proper shot placement. Reasons attributed to the more deadly energy for 5.56x45mm NATO cartridge include; Gas Pressure. A 5.56 mm rifle round has higher pressure gas which results from the imploding and expanding powder. This ...But it all hinged on the kinetic energy transfer theory, which turns out to be incorrect. Where it All Goes Wrong. From at least the late 1800s through the Vietnam War, everyone assumed the kinetic energy transfer model was correct. The "shock" of getting hit by a fast-moving projectile and absorbing its kinetic energy contributed to ... How much kinetic energy to kill a deer, Venison is an excellent and healthy meat, and we should treat deer carcasses as food products throughout the whole process. All stalkers must be capable of removing all internal organs (gralloching) and inspecting a deer carcass. ... Min muzzle energy: Red, Fallow and Sika England & Wales n/a: Not less than .240 inches: 1,700 foot pounds ..., To kill a deer ethically you need at least 25lbs kinetic energy. Yours will have more than enough at 30 yards. Posted By: 4dog. Re: 245 fps Crossbow/ Does it ..., Kinetic energy equals velocity squared, multiplied by mass, divided by 450,240. The sum equals the kinetic energy — a.k.a. KE in foot pounds — of an object in motion. ... Just as you can cleanly kill deer with a .22 Hornet, you can also kill elk with wide-cutting mechanicals and light arrows — if everything proceeds according to script ..., Surely the massive energy of a 375 H&H, 458 Win. Mag., or 458 Lott will kill a deer instantly every time, right? Don't count on it. I've seen half-grown whitetails take a 50-caliber through the chest and run 25 yards before falling., Mar 18, 2014 ... I know that for deer you want to be over 40 ... 68 momentum I don't really know how much power that is. ... kinetic energy. Sectional density and ..., 11326 posts · Joined 2010. #9 · Oct 5, 2021. It’ll kill a whitetail at whatever range you can hit with it, based on trajectory. Energy-wise you’d be good to at least 300 but you’ll be aiming a couple of feet high., Nov 09, 2005 #6. I had a know it all at an archery shop (the shop keeper) tell me that my 50lb hickory bow that I shot through his chrony at 155 fps could not kill a deer because "you need at least 40 foot pounds of kinetic energy to kill a deer". Damon. flushls. 151., The unofficial rule regarding minimum KE to push an arrow through a deer is about 40 foot-pounds. Lower-poundage bows are slower than higher-poundage models. So, let’s say the bow is pushing a 350-grain arrow at 265 feet per second. That setup is delivering roughly 54 foot-pounds of KE and .411 slugs of momentum., ? on Kinetic Energy. Jump to Latest Follow 5K views 11 replies 9 participants last post by monster fan Aug 19, 2012. T ..., Oct 27, 2012 · Accuracy trumps kinetic energy and momentum of the arrow. You could kill any whitetail deer with a 45 lb bow shooting a 300 grain arrow with a field point. But if you don't hit the vitals it wouldn't help shooting a 500 grain arrow with a 80 lb bow and a 3" head. You might end up with a dead deer but good luck finding him. , Step 1. A coffee filter of mass 0.0016kg dropped from a height of 2.7m reaches the ground with a speed of 0.23m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter? Start from the Energy Principle, and choose as the system the coffee filter, Earth, and the air. Kair=1 Submit Answer Tries 0/5., For deer hunting, a crossbow with a FPS (feet per second) of 300-350 is ideal as it provides enough power and speed to effectively take down a deer without causing excessive damage to the animal. ... Using a crossbow with a lower FPS for deer hunting may result in an inadequate amount of kinetic energy, potentially causing the animal to suffer ..., A 500 grain arrow moving at 260 fps has a kinetic energy of 75.04 ft-lbs and a momentum of .577 slugs*. A 700 grain arrow moving at 175 fps has a kinetic energy of 47.59 ft-lbs and a momentum of .544 slugs*. *The slug is a measurement of force defined as the mass that is accelerated by 1 ft/s 2 when a net force of one pound (lbf) is exerted on it., 3,567. Location. Falls Church, VA. Sep 12, 2010. #3. Although I agree with bigngreen that 1000lbs of energy and a well placed shot will take elk, the conventional wisdom says you need 1500 pounds of energy. So I ran your load in exbal and found that you have 1500lbs of energy at 500 yards and 1000lbs at 800., I would be concerned about getting the setup to where it produces at a minimum 30-35ft/lbs of kinetic energy....that is enough to kill a deer, but razor sharp broadheads and proper shot placement are the keys. I have seen several deer taken by kids pulling around 40#. Also....I take anything said by the big box employees with a large …, Most of the conventional .177, .20, and .22 spring piston rifles on the market today will generate between 10 -20 fpe of energy, with outliers in either direction. A few, especially the big .25 magnums can go considerably higher tracking up into the 30 fpe range. That is enough power to take anything up to a raccoon size animal if the correct ..., With archery deer hunting season just around the corner, ... Don't Take a Shot at a Deer If You Think It Will Require a Second Shot to Kill the Animal. ... even if you are shooting a high-performance crossbow that launches crossbow bolts at extreme speeds and higher levels of kinetic energy. Even crossbow bolts have a limit as to how much ..., Then .051/32 = .0016 slug. finally. .0016 x 280 = 0.448 s/fps momentum. Now, given broadheads of identical design, cutting width and sharpness, the combination with .500 slug-feet per second momentum will penetrate better than the faster but lighter combination at .448 slug-feet per second. If we had used the formula for kinetic energy, the ..., A recent example that demonstrates this clearly is this video by DIY Sportsman. The data given spans arrow masses from 379.4 grains to 1163.5 grains. That is an increase in arrow mass of 207%—a tripling of arrow mass. The kinetic energy of the arrow leaving the bow increased from 73.3-77.9 ft·lb., a mere 6% increase., If the bullet is too light for the intended game it may simply lack enough kinetic energy to cause hydrostatic shock, meeting far too much resistance on impact. This a common occurrence with the .22 centrefires but can also occur in any small bore cartridge especially the large magnums when using soft, light for caliber projectiles., They state that on permitted public lands, you can hunt deer with an air rifle as long as it meets the following conditions: The projectile must be at least 30 caliber in diameter. The projectile must be at least 150 grains in weight. The projectile velocity must be a minimum of 800 feet per second. OR any combination of bullet weight and ..., 4. Use a Heavy, Low-Diameter Arrow. All other things being equal, a heavier arrow at a slightly lower speed will out-penetrate a lighter arrow at a slightly faster speed. Think of it like this — A basketball zipping through the air is much easier to stop than a bowling ball flying at half the speed., Mar 3, 2019. Messages. 4. My total arrow weight with the 125gr. Broadhead weighs 428 gr. Our shots have been perfect broadside shots, but only punching through one side and not both. I have looking at the Full Metal Jacket 400 @ 10.2 GPI. Which would bring m up to 465g or go to to FMJ 340 @ 11.3GPI and be at 497gr., A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is A) more than 100 J. B) less than 100 J. C) 100 J. D) not enough information given, how many people would think of shooting a deer or moose at 600 yards. ... When I was much younger I made a super kill ... Kinetic energy by its very ..., The list that follows is intended to suggest the relative killing power of various hunting cartridges and loads at 100 yards when those cartridges are used appropriately. ( Cartridge, bullet weight in grains, muzzle velocity in feet per second - killing power score at 100 yards.) .223 Remington (60 grain at 3000 fps) - 6.3., For small fur varmints - rabbits and possums - a .177 rifle should not be used in my opinion, simply because I believe at least 100 foot pounds of energy is needed to humanely kill the animal, and to achieve this with a .177- it would need to be shooting an 8 grain pellet at over 2700 fps - which is impossible for an air rifle!, As LR hunters we need to have a basic guideline for how far is too far. 1000 ft/lbs used by many people on this site as a guideline, not the rule. 1600 fps (or whatever the manufacturers spec is) is a good Guideline for how slow most high B.C copper jacketed bullets will open reliably., The 6.5 PRC is a perfect choice for hunting deer. Deer hunters recommend hitting with at least 1,000 ft-lbs of energy for an ethical kill, and the PRC maintains that power out to 812 yards. Most 6.5 PRC loads utilize high BC bullets which aid in wind deflection, and its short action allows for use in lighter rifles., In North Carolina, a 35 pound pull compound is legal for hunting. Recurves have to be 45 pounds. Compounds used to be 45# also but this was changed by the NCWRC after the NC Bowhunters Assn. showed them that modern compounds at 35# had as much kinetic energy as 45# recurves., Sep 7, 2021 ... 5:26 · Go to channel · The Truth about Kinetic Energy and Momentum for Deer Hunting. Exodus Outdoor Gear•11K views · 22:17 · Go to chann..., A coffee filter of mass 1.3 grams dropped from a height of 1 m reaches the ground with a speed of 0.7 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter? Start from the Energy Principle, and choose as the system the coffee filter, the Earth, and the air 0.012 Additional Materials Section 7.10, As LR hunters we need to have a basic guideline for how far is too far. 1000 ft/lbs used by many people on this site as a guideline, not the rule. 1600 fps (or whatever the manufacturers spec is) is a good Guideline for how slow most high B.C copper jacketed bullets will open reliably.