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Joined: Jan 2010
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Joined: Jan 2010
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Does anyone here know the formula for calculating foot pounds of energy for a load? I know it involves the velocity and bullet weight.
"...why, land is the only thing in the world worth working for, worth fighting for, worth dying for,... because it is the only thing that lasts."
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Joined: Jun 2001
Posts: 19,067
Campfire Ranger
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Campfire Ranger
Joined: Jun 2001
Posts: 19,067 |
Velocity Squared X Bullet weight/ Divided by 450240
Example.
1200 x 1200 x 150 / 450240=
360000/450240=
479.74 ft lbs
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Joined: Jan 2001
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Campfire Outfitter
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Campfire Outfitter
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Henry, While this isn’t an answer to your question......here’s a link to a very informative website. It gives much info/inside into ft/pounds energy, momentum, Taylor KO values, ect. It may cause you to question what we’ve been led to believe most of our lives! memtb
You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong." -Bob Hagel
“I’d like to be a good rifleman…..but, I prefer to be a good hunter”! memtb 2024
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Campfire Tracker
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Campfire Tracker
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memtb
If you would be so kind, I would not mind seeing that link myself!
Some spelling errors can be corrected by a vowel movement.
~ MOLON LABE ~
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Joined: Jan 2001
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Campfire Outfitter
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Sorry! Damn, I must be getting old.....I thought that I had provided the link!  I’ll try again! memtb http://rathcoombe.net/sci-tech/ballistics/wounding.html
You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong." -Bob Hagel
“I’d like to be a good rifleman…..but, I prefer to be a good hunter”! memtb 2024
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Joined: Dec 2005
Posts: 1,413
Campfire Regular
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Campfire Regular
Joined: Dec 2005
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Thanks for the link, memtb.
The "Power Factor" used for Single Action / Cowboy shoots is flawed, but it provides a yard stick kind of standard that is VERY easy to calculate.
Bullet wt in grains X velocity in fps divided by 1000 such as the old .38 Special LEO load of 158 X 850 = 134.3 PF
1,000
The SASS knock-down targets are configured to fall at that level of power. I think the IPSC Power Factor is calculated the same way, with Major and Minor categories.
These formulas are just crunching numbers, not related to real life effectiveness, but I remember seeing the Colorado hunting regulations at one time specififying that 1000 foot-pounds ...or is it properly pounds-feet?...of Kinetic Energy is the minimum for hunting big game. I found a handy table for calculating KE in one of my older Speer books.
“You must endeavour to enjoy the pleasure of doing good. That is all that makes life valuable.”
Robert E. Lee, in a letter to his invalid wife.
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