Stopping power, caliber, speed ? - Page 2 - Graybeard Outdoors
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post #11 of 15 (permalink) Old 06-28-2019, 10:54 AM
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That 2200 fps number is very good to think about IMO. A small caliber at high speed skipping around inside the body does alot of damage.
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post #12 of 15 (permalink) Old 07-05-2019, 04:30 PM
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That could account for many older cartridges having a traditional muzzle velocity of 2200 ft./sec.
.33 WCF, .30-30 (170gr.), .30-40 (220gr.), well, maybe Winchester cartridges...
Interesting thread, though.
I know, to calculate energy based on speed and weight, all you do is square the velocity (ft/sec.) divide by a constant (450240) then multiply by weight (grains) and what you end up with is energy expressed in ft./lbs.
So, let's take one of the above mentioned cartridges...the .30-30.
When loaded with 170 gr. bullet, muzzle velocity is 2200 ft./sec.
So here's how the formula would go....
2200 x 2200 = 4840000
4840000 / 450240 = 10.7498223169865
10.7498223169865 x 170 = 1827.469793887704

...or, a little over 1827 ft.lbs. ME

Learned that from a Wiley Clapp article.

"Stopping Power" obviously involves a little more than just pure energy, but that is how part of the equation goes, anyway.
Maybe we should look at "Stopping Power" as the bullet's ability to transfer the available energy to your quarry.

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Last edited by DCman; 07-05-2019 at 04:49 PM.
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post #13 of 15 (permalink) Old 07-05-2019, 05:17 PM Thread Starter
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Here's a very handy site for finding out FPE for nearly any popular cartridge. http://www.ballistics101.com/muzzle_energy_calc.php

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post #14 of 15 (permalink) Old 07-05-2019, 05:26 PM
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Apologies for passing on information that others may find handy.
I was only trying to help.

1981 Topper 088, 20 gauge, 25" barrel, choke opened from full to modifed (Walker Arms, Selma Alabama), Limbsaver recoil pad
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post #15 of 15 (permalink) Old 07-05-2019, 05:28 PM Thread Starter
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Quote:
Originally Posted by DCman View Post
...or you can use the knowledge of knowing how to calculate it yourself. MUCH handier, in my opinion.
Choose your poison..

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