wvbearhunter
Well-Known Member
Look at all the critters killed with 357 mag and 10mm handguns neither of which gets close to 1000ft lbs.
How Much energy is too little?
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HARPERC
Well-Known Member
It's KE i have issues with. It can't be disputed as a calculation, how that energy is transferred to the vitals is the rub.
How much of that KE is used deforming the bullet matters.
Nevernind but do try K.E.= 1/2 m V^2. I think some energy calculators are wrong as K.E is lbs ft^2/s^2
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Me? I expect my bullet to look like this hitting game.
There is nothing to disagree with. It is what it is. The min velocity is simply when a bullet starts expanding and there is no secret why it is similar across different cartridges. It is because they are using similar materials which require similar dynamic pressures to deform.
Once a bullet expands, fragments, and crushes tissue this is energy transfer from the bullet to the animal. Basically, an equal and opposite force to what is causing the bullet to deform and slowdown. Velocity nor energy are driving anything. They are a magnitude describing something different.
When people say you need a certain amount of velocity to expand that is reasonably easy to quantify. When somebody says you need a certain amount of energy to kill something that is a lot more complex act to quantify but it is still transfer of energy that does the work
Lou
HARPERC
Well-Known Member
All this talk of "minimum" KE, and I'm always wondering what the most I can acquire without being added to more lists.
Watched the amateur rocket guys play on the Black Rock desert, they were on the right track.
I don't look too hard at calculated energy since it is just a calculation from the physics of the shot. I demand evidential terminal performance from any bullet I use to exert the most tissue damage while driving through the animal. I perform post mortem on every animal I kill even with bow to understand how and why the animal died. If you are not performing a post mortem, you really need to better understand the terminal performance relative to the animal. Energy is absolutely WORTHLESS without terminal performance.
RichCoyle
Well-Known Member
Try this; it's what I provided in #60. It allows you to change the units.
https://www.calculatorsoup.com/calculators/physics/kinetic.php
Idaho Lefty
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YUP,. THAT'S, a 140 grain Hunting version Berger, Launched at, 3,200 FPS from,.. a .270 Wby or, .270 WSM !
Kill's Elk as, Quickly as,.. a .338 Win. Mag. ( Used Both on Elk, so I have, some experience at,.. THIS ! )
Agree with Dogz post # 84 ! No need of MORE, Recoil or, Power than, a fast, .270 Bullet.
A well "Expanded" Bullet, thru the Lungs,.. gets the Job,.. DONE !
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I know that, but I do it on my calculator. Just like in school, honoring units!
This is EXACTLY what I got from a 130gr .264 Berger VLD at 347 yards from a 6.5PRC. Nearly cut my speed goat in half.
I don't know if this anwers your question, however, a few decades ago when I was in college, one of my engineering courses was in applied energy. We calculated that based upon density and mass, it would take approximately 1000ftlbs of force to be lethal to an animal the size of a deer.
Now that said, I retired 7 years ago and now I can barely amass enough energy to take a nap!
Now that said, I retired 7 years ago and now I can barely amass enough energy to take a nap!
