Muzzle Energy..need help computing

[omgb]

OK, if I have an 850 grain slug going 1250 fps 10 feet from the muzzle, what kind of energy does this load generate?

[Lefty SRH]

about 2,050 ft lbs of energy

[Lefty SRH]

I can give you Taylor Knockout points if you give me the bullet diameter.

[omgb]

OK, a guy sent me the formula and I came up with 2,949.674 foot pounds of energy or 3999.18555 joules. The bullet is .735" in dia. So, what does the Taylor scale say?

[frnkeore]

The formula is ,

Weight in gr x velocity squared
------------------------------------
450240


850 x (1250 x 1250) 1562500 = 1328125000

1328125000 / 450240 = 2949.82 FP/energy

Frank

[omgb]

thanks to all of you. The Taylor KO scale rates that load at 111.6. The Thornly Stopping Power scale rates it a 407. That same scale says that for deer you need 50, for moose/elk 120, for lion, grizz and Kodiak you need 150 and for Hippo, Elephant and cape Buff you need 250. So, if you have an big stuff that needs killing, my .735 Tallywacker will get the job done. I was shooting a reducd load of 150 grains of 2F and got 1250 fps +/- 10 fps. Group size was at 3" at 100 yerds but....I think the rounds will do better. I was getting bashe by a guy with a short barreled .223 and a muzzle brake on my right and I was shooting on a left handed bench through the Chrony...not the best set up for bench accuracy. Dang, guys, 9 rounds was painful!

[Lefty SRH]

What weapon and caliber designation is this you are asking about?

[Lefty SRH]

post a link to the Thornly Stopping Power scale

[Lefty SRH]

Taylor Knock Out scale formula: http://www.reloadammo.com/tkofactor2.htm

Kinetic Energy: http://www.reloadammo.com/footpound2.htm

[Jim]

The formula is ,

Weight in gr x velocity squared
------------------------------------
450240


850 x (1250 x 1250) 1562500 = 1328125000

1328125000 / 450240 = 2949.82 FP/energy

Frank

I see it's changed. Last I heard the denominator was 450500.That was a couple three years back, though.

[frnkeore]

The old 8 bore at about 150 TKO was a good elephant round. I don't think the elephants knew that it wasn't in the 250 range :) The trigger puller knew he had created a "event" too.

1250 gr bullet @ 1000+ fps

My constant of 450240 came from Speer info.

Frank

[omgb]

This is my "wildcat" .735 Talleywacker. 3" 12 bore case with internal dia of .737 from Rocky Mtn Cartridge Co. , .735 850 grain slug, 150 grains 2F Win 209 primer and a .125 nitro wad, .75 fiber wad, .125 nitro wad wad column.

R J Talley

[Chicken Thief]

E = ½ x M x V x V

Where:

E = Engergy in joules
M = Mass of projectile in kg (kilo gram)
V = Velosity in m/S (Meters per Second)

850gr = 55.08gram = 0.05508 kg
1250fps = 381m/s
1ft/lbs = 1.356joule

So:
E = ½ x 0.05508 x 381 x 381 = 3997.75 joule / 1.356 = 2948.2 ft/lps