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griz · October 15, 2002, 10:41 PM

I've never reloaded 9mm for a carbine but have for 38s and 357s. The principle will be the same. I’m also assuming that when you say optimizing performance you mean more velocity.

Although almost all loads will probably benefit from a longer barrel, the loads with slower powders will gain the most. These are the ones that will be producing the highest velocities even with pistol length barrels, AA #7, Power Pistol, Blue Dot, and similar ones. You might even try the slowest pistol powders, but you will have trouble finding data from which to work.

October 15, 2002, 10:41 PM	#2
griz Senior Member Join Date: July 31, 2000 Location: Middle Peninsula, VA Posts: 1,588	I've never reloaded 9mm for a carbine but have for 38s and 357s. The principle will be the same. I’m also assuming that when you say optimizing performance you mean more velocity. Although almost all loads will probably benefit from a longer barrel, the loads with slower powders will gain the most. These are the ones that will be producing the highest velocities even with pistol length barrels, AA #7, Power Pistol, Blue Dot, and similar ones. You might even try the slowest pistol powders, but you will have trouble finding data from which to work.