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Old April 8, 2002, 07:08 PM   #1
Shootin' Shane
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Ballistics for .45acp from rifle barrel?

Does anyone know where I could find ballistic info for a .45 auto cartridge out of a rifle barrel? My brother just bought a HK USC .45, and we were curious how the .45acp preforms out of a 16 inch barrel. Or does an extra 11-12 inches of barrel even make much difference? The ammo websites I've checked only show pistol specs. Thanks, Shane
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Old April 8, 2002, 09:07 PM   #2
Ledbetter
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Check the Mech Tech carbine website

They make a product that converts a 1911 into a .45 carbine. IMR, they have the numbers you want on their website. There is a significant gain in velocity and the trajectory is flat out to about 75 yards. The drop at 100 yards is about 6 inches.

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Old April 8, 2002, 10:24 PM   #3
Deadman
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Here's a couple of links to 2 online ballistic calculators that I find very useful -



http://internet.cybermesa.com/~jbm/b...raj_basic.html


http://www.handloads.com/calc/
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Old April 8, 2002, 10:41 PM   #4
Shootin' Shane
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Hey, thanks a lot, guys!
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Old April 8, 2002, 11:12 PM   #5
trapshooter
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Another resource

is Sierra's Rfle reloading manual (the new one anyway). Has .45 ACP load/velocity data developed using a 16.5" Marlin Mod.45. Close enough for gummint work, imho. This is what I use to do ballistics with my MechTech ccu.
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Old April 9, 2002, 12:17 AM   #6
Dave T
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I got to borrow a Marlin Camp Carbine (16.5" barrel) for a while and got the following chronograph results:

WW Ball (230g) = 861 fps

Federal Hydra-Shok 230g = 978 fps

5.4g WW 231 behind a 225g cast bullet = 995 fps

This was from 50-150 fps faster than those same rounds delivered in a 5" Government Model.
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Old April 9, 2002, 12:36 AM   #7
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Seems that low-pressure cartridge doesn't gain much from the longer bbl. However, the USC groups great at silly distances (say 200 yds) once you figure out the hold-off !
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