Tuesday, January 19, 2010

Wat is fpe? and where can i find a chart on it or a chart on how much fps to kill a squirrel, rabbit or small?

%26gt;%26gt;What is FPE%26lt;%26lt; FPE = foot-pounds of energy





Here is your FPE calculator


http://www.pyramydair.com/site/articles/鈥?/a>





6fpe is ';around'; the minimum for small game such as rabbit %26amp; squirrel. So long as you use proper shot placement and hunting pellets





with a .177


575fps - 8.2gr=6.02fpe





with a .22


435fps - 14.5gr=6.09fpe


These are the minimums necessary at ';impact';.





This should give you some idea of the minimum velocity with the ';average'; pellet weight for hunting small game.





Later: %26gt;%26gt;A .177 pellet typically losses 50% of it's fpe at 50'%26lt;%26lt;


Oh really, according to my calculator an RWS Superpoint .177 pellet leaving the muzzle at 1000fps loses 50% of it's fpe at 27.4yds(82.2ft) NOT 50ft(16.67yds) that's quite a difference





%26gt;%26gt;You need about 20fpe for a clean humane kill of the small game you mention%26lt;%26lt; This is total BS, I have been hunting rabbit with air rifles for over 45 years and in my experience 6fpe is plenty with proper shot placement and hunting pellets.


';Real'; experts will tell you that 3-4fpe is the minimum for squirrel. IMO that's pushing it.


http://www.network54.com/forum/79537 %26gt;these are serious airgunners





.177 - 1000fps - 8.2gr=18.21fpe


.22 - 800fps - 14.5gr=20.61fpeWat is fpe? and where can i find a chart on it or a chart on how much fps to kill a squirrel, rabbit or small?
fpe or ftlbs, foot/pounds, is a measure of kinetic energy or what shooters loosely term as a guns 'power' for comparitive purposes.





The basic formula excusing the written math is-


Velocity(in feet per second) x velocity x bullet mass(in grains)/450400





Energy and ballistic calculators are all over the web. Just input data into them and select range.Wat is fpe? and where can i find a chart on it or a chart on how much fps to kill a squirrel, rabbit or small?
FPE is Foot Pounds Energy, at the barrel. It is a simple calculation that doesn't take in any other factors.


First off, I doubt what ever you are shooting at will be right at the end of your barrel.


You want to find out how much fpe is delivered on target. Lots of factors are involved, and this isn't an engineering level discussion of ballistics. The first factor is weight of the projectile. A .177 pellet typically loses 50% of it's fpe at 50'. That's not set in stone. An identical .22 pellet being 80% heavier loses only about 40% of it's fpe at 50'. This is called momentum. A .22 cap and ball rifle bullet being 3x heavier than a .22 pellet is far deadlier at 100' than the .22 pellet, even though the muzzle velocity is similar. A cap and ball round isn't like your typical .22LR it is just primer and a bullet. No powder. A .22 LR bullet is not only 3x the mass of the pellet, it is also leaving the gun at twice the velocity.


Other factors include the aerodynamics of the projectile and how is shaped effects the damage it does at impact both in terms of the amount of damage and the way the damage is done.


simply put, you need about 20 fpe for a clean humane kill of the small game you mention. That works out to 800 fps with a 14 gr pellet, in other words, a .22 pellet. There's some heavy Beeman pellets in .177 that come in around 10gr. They might get out the muzzle around 800 fps if your gun is advertised at 1000 fps. That's just over 14 fpe. Not enough power for a good kill unless you are about 10-15' away. A lighter pellet will deliver less energy at impact, even if it travels out the barrel faster.
I talked with 3 wildlife officers today , about using pellet %26amp; BB guns, for shooting rabbits %26amp; squirles %26amp; was told be all 3, that if they found someone using a BB or pellet gun, that they would issue that person a citation, because in the vast majority of the cases that they have seen, the animals were not killed, just wounded
Plenty of ballistic charts are available online, but you need to advise if you are talking about a real firearm or an air rifle.It would also help to know what caliber you wish to know about too......
FPE= foot pounds of energy


FPS=feet per second





FPE is the power a round delivers at a specific distance from the muzzle.


FPS is the velocity at which the round hits the target at a specific distance from the muzzle.





FPS doesn't determine killing power . FPE does. The FPE you'd need to hunt squirrel isn't much. Anything in .22lr would suit you fine. Look at winchester.com under their ammunition listings for complete ballistics charts of common hunting, plinking, and self defense rifle and handgun rounds, and recommended uses for each.

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