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DonVoigt · 02-16-2019, 01:45 PM

I do believe the answer is :
"no one knows".

Without testing, I would "guess" that a 12" or there about .30 luger barrel gets practically all of the velocity achievable; there is a point at which a longer barrel actually slows the velocity of a projectile- I have no idea what that length is either. JMHO.

I can tell you from first hand experience that a built .30 luger carbine will not function with a 16" barrel(too heavy) but will with the 12" barrel; however, a 16" 9mm barrel on the same lower will function as it should. So with that info and a cup of coffee you can theorize some more.

02-16-2019, 01:45 PM	#8
DonVoigt User Join Date: Apr 2015 Location: near Charlotte NC Posts: 4,681 Thanks: 1,443 Thanked 4,355 Times in 2,041 Posts	I do believe the answer is : "no one knows". Without testing, I would "guess" that a 12" or there about .30 luger barrel gets practically all of the velocity achievable; there is a point at which a longer barrel actually slows the velocity of a projectile- I have no idea what that length is either. JMHO. I can tell you from first hand experience that a built .30 luger carbine will not function with a 16" barrel(too heavy) but will with the 12" barrel; however, a 16" 9mm barrel on the same lower will function as it should. So with that info and a cup of coffee you can theorize some more. __________________ 03man(Don Voigt); Luger student and collector. Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie