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Old 01-25-2010, 12:37 AM   #11
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Thank you gentlemen I appreciate the information.

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Old 01-25-2010, 02:40 AM   #12
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Two different things here- related, but different. Energy is mass(in grains) x speed (feet per second) squared, divided by 450411. For the math challenged, here is a calculator: Muzzle Energy Calculator

The answer is in ft lbs- not lbs per square foot. One foot lb is equal to one lb falling one foot.

HOWEVER- then we come to terminal ballistics- how well the projectile transfers energy to the target. IN GENERAL- the bigger cross section transfer energy more efficiently. Which explains expanding bullets, such as hollowpoints. But then you have rounds that de-stabilize on impact- such as .223, the Brit 38-200, etc. And pre-fragmented rounds, such as the Glaser Safety Slug, etc.

So a 25-06 and a .25 ACP have the same diameter bullet, but the .25-06 is heavier, and much faster, and has a lot more energy. A .308 and 30-06 may use same weight/ diameter bullet, but the 06 is faster- has more energy. A 158 grain .38 Special is 21% heavier than a 125 gr .357 mag- but the mag is moving much quicker- and has more energy.

This discussion is a long one, well suited for a least a 6 pack by the fire. Who's got the pretzels, anyway?

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Old 01-25-2010, 03:41 AM   #13
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Quote:
Originally Posted by c3shooter View Post
Two different things here- related, but different. Energy is mass(in grains) x speed (feet per second) squared, divided by 450411. For the math challenged, here is a calculator: Muzzle Energy Calculator

The answer is in ft lbs- not lbs per square foot. One foot lb is equal to one lb falling one foot.

HOWEVER- then we come to terminal ballistics- how well the projectile transfers energy to the target. IN GENERAL- the bigger cross section transfer energy more efficiently. Which explains expanding bullets, such as hollowpoints. But then you have rounds that de-stabilize on impact- such as .223, the Brit 38-200, etc. And pre-fragmented rounds, such as the Glaser Safety Slug, etc.

So a 25-06 and a .25 ACP have the same diameter bullet, but the .25-06 is heavier, and much faster, and has a lot more energy. A .308 and 30-06 may use same weight/ diameter bullet, but the 06 is faster- has more energy. A 158 grain .38 Special is 21% heavier than a 125 gr .357 mag- but the mag is moving much quicker- and has more energy.

This discussion is a long one, well suited for a least a 6 pack by the fire. Who's got the pretzels, anyway?
I prefer peanuts....
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Old 01-25-2010, 03:59 AM   #14
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Only if they are Virginia Peanuts. they are the biggest of the peanuts grown in the USA.

Just know that the bigger something is and the faster something is moving the more it if going to effing hurt when it hits your ass.

OK

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