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#6278168 - 04/27/16 07:53 PM Energy @ target
DLALLDER Offline
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Registered: 11/23/05
Posts: 3218
Loc: Pittsburg, Texas
Let's make an assumption. I have 2 guns one with 22" barrel, the other with 20" barrel. Both are same caliber firing the same weight & brand bullet and powder. Assume a muzzle velocity of 2800 fps with 22" gun, what would be your estimate of MV with the 20" barrel & how much difference will the energy be at 200 yds between the 2 guns?
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#6278185 - 04/27/16 07:59 PM Re: Energy @ target [Re: DLALLDER]
FiremanJG Offline
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Registered: 12/16/08
Posts: 23316
Loc: Wolfe City, TX
20" barrel subtract 40-50 fps MV from the 22" barrel's MV.

www.jbmballistics.com will tell you energy. The problem with your initial post is that you failed to mention caliber, bullet weight, and ballistic coefficient. All of those have a bearing on what retained velocity the bullet is carrying down range, and subsequently, the amount of energy the bullet will deliver.










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#6278226 - 04/27/16 08:21 PM Re: Energy @ target [Re: DLALLDER]
ChadTRG42 Online   happy
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Registered: 09/16/09
Posts: 12235
Loc: Lewisville, TX
20-25 fps per inch is a good rule at the muzzle.

Bullet energy is based on bullet weight and speed, and it's easy to figure out with link above.
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#6278436 - 04/27/16 11:46 PM Re: Energy @ target [Re: DLALLDER]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 22548
Loc: Texas
They covered it well. Also depending on the barrels, I have seen a fast barrel shoot faster than one 2 inches longer so nothing is set in stone, but the rule of thumb above is pretty close most of the time.
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