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| One of Us |
What is the formula to calculate energy ie 300 fr 375 @ 2625 fps, 415 gr arrow @ 241 fps? thanks | ||
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one of us |
There are some calculators available online, like this one, or you can download free software like Point Blank. Here is the formula. ------------------------------- Some Pictures from Namibia Some Pictures from Zimbabwe An Elephant Story | |||
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one of us |
http://www.handloads.com/calc/quick.asp NRA Life Member, Band of Bubbas Charter Member, PGCA, DRSS. Shoot & hunt with vintage classics. | |||
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Moderator |
here you go E=MV^2/450400 that's m*(v*v)/450400 or (mass times velsquared)/450400 opinions vary band of bubbas and STC hunting Club Information on Ammoguide about the416AR, 458AR, 470AR, 500AR What is an AR round? Case Drawings 416-458-470AR and 500AR. 476AR, http://www.weaponsmith.com | |||
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One of Us |
Velocity times velocity, divided by 7000, divided by 64.32, times weight = energy 30-06 2800 x 2800 divided by 7000 divided by 64.32 = 17.41 x 160 gr. = 2786. lbs. ft. | |||
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One of Us |
If you really want to be able to do it longhand, here is the formula: PKE = ((½ x PW/GC) x PV^2) ÷ 7000 Where: PKE = Projectile kinetic energy in foot-pounds. PW = Projectile weight in grains GC = 32.174 (the gravitational constant for earth in feet per second per second) PV = Velocity of projectile in feet per second ^2 means "squared" 7000 = Number of grains per pound So, for one of my favorite .500 A-Square hunting loads, namely, a 570 grain bullet with a muzzle velocity of 2,525 feet per second, the muzzle energy would be calculated as follows: ME = ((½ x 570/32.174) x 2,525^2) ÷ 7000 ME = ((½ x 17.716) x 6,375,625) ÷ 7000 ME = (8.858 x 6,375,625) ÷ 7000 ME = 56,475,286 ÷ 7000 ME = 8,068 ft.-lbs. Mike Wilderness is my cathedral, and hunting is my prayer. | |||
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one of us |
Now here is too much gun!! ------------------------------- Will Stewart / Once you've been amongst them, there is no such thing as too much gun. --------------------------------------- and, God Bless John Wayne. NRA Benefactor Member, GOA, N.A.G.R. _________________________ "Elephant and Elephant Guns" $99 shipped “Hunting Africa's Dangerous Game" $20 shipped. red.dirt.elephant@gmail.com _________________________ Hoping to wind up where elephant hunters go. | |||
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| One of Us |
Too much energy??? No such thing :-) | |||
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| One of Us |
Perish the thought! Mike Wilderness is my cathedral, and hunting is my prayer. | |||
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Remember, for every action there is an equal and opposite reaction. Recoil NRA Endowment Life Member | |||
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| One of Us |
That why they put a big butt stock on a 500 a square. I have shot mine with 600 grain bullets at 2630 ft/sec. for 9216 ft.lbs of energy. Thats about max for me out of the 500 A Square. energy formula bullet wt. in grains times velocity in ft/sec times velocity in ft/sec, all divided by 450,300 = ft.lbs of energy. | |||
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| One of Us |
8000 ft lbs is not that bad. I find once it hits 10,000 ft lbs, that's when I find my limit !!! | |||
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| One of Us |
This is just the big bore wannabe crowd.  | |||
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| One of Us |
Okay. Here's the deal. You get me a Form 4457 for that Solothurn, then get it through check in at Logan airport (including paying the excess baggage allowance!), and then carry that Swiss miss, plus ten rounds of her 20 mm AP ammo, for ten hours plus, over 10 or 12 miles, in 100 degree Fahrenheit heat . . . And then, if we can find a big enough bull elephant (no guarantees!), and also -- if you'll be my shooting sticks and allow me to rest that 20 mm monster on your shoulder - well, then, I say - that is, then - and only then - I'll shoot that big bull elephant with that Big Bertha! And maybe, just maybe, not be undergunned!  Okay? Hell, if I could've, I would've done it by now! It's just that the practical tends to rear its ugly head from time to time!   Mike Wilderness is my cathedral, and hunting is my prayer. | |||
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| One of Us |
Practical depends upon your frame of reference. Money and determination can solve all of the problems you mentioned. Ship the gun ahead. Hire a crew to carry it. It is a crew served weapon. Spend a month finding your elephant. It is not like you have to stalk within 50 yards. | |||
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| One of Us |
SR4759, want to impress me, run a video of you shooting that thing offhand at a running target. Rich I shot a four-bore DR last month | |||
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