The Firing Line Forums - View Single Post - Can the 147gr 9mm be made hotter than +P+

Lost Sheep · June 23, 2011, 01:42 AM

Foolishly? Yes. Wisely? No.

Look up 38 Super or 9x25 Dillon cartridges. Those are what you want. Or a Coonan .357. The .357 Sig and the 9x21 will have the same bullet weight/length/size problems as the 9x19 mm.

9xx19 and 9mm Parabellum) were simply not intended for the kinds of pressures the loads and bullet weights you contemplate would generate. Longer bullets present feeding problems (longer OAL) unless you seat them deep, which raise pressures, sometimes dangerously.

You could build such a gun. But manufacturers today have designed their guns for standard SAAMI pressures.

For an interesting comparison, look up the differences between 45ACP, 45ACP+P and 45 Super (which uses the same case dimensions as the 45 ACP, but requires a stronger recoil spring and DEFINITELY a stronger chamber).

What you are describing is tantamount to a 9mm Super, similar to a 45 Super. A regular sized case intended for above SAAMI pressures, therefore requiring a stronger chamber, recoil spring and probably beefed-up frame, just as the 45 Super does.

I have gone really overboard in the description it is because I am concerned about the safety of going beyond the design parameters of your hardware.

Generally speaking, a bad idea. But intriguing. Are you trying to find a loading that will make major rating in a 9x19 platform?

Good luck,

Lost Shttp

June 23, 2011, 01:42 AM	#23
Lost Sheep Senior Member Join Date: January 24, 2009 Location: Anchorage Alaska Posts: 3,341	Are you talking about the 38 Super? Foolishly? Yes. Wisely? No. Look up 38 Super or 9x25 Dillon cartridges. Those are what you want. Or a Coonan .357. The .357 Sig and the 9x21 will have the same bullet weight/length/size problems as the 9x19 mm. 9xx19 and 9mm Parabellum) were simply not intended for the kinds of pressures the loads and bullet weights you contemplate would generate. Longer bullets present feeding problems (longer OAL) unless you seat them deep, which raise pressures, sometimes dangerously. You could build such a gun. But manufacturers today have designed their guns for standard SAAMI pressures. For an interesting comparison, look up the differences between 45ACP, 45ACP+P and 45 Super (which uses the same case dimensions as the 45 ACP, but requires a stronger recoil spring and DEFINITELY a stronger chamber). What you are describing is tantamount to a 9mm Super, similar to a 45 Super. A regular sized case intended for above SAAMI pressures, therefore requiring a stronger chamber, recoil spring and probably beefed-up frame, just as the 45 Super does. I have gone really overboard in the description it is because I am concerned about the safety of going beyond the design parameters of your hardware. Generally speaking, a bad idea. But intriguing. Are you trying to find a loading that will make major rating in a 9x19 platform? Good luck, Lost Shttp Last edited by Lost Sheep; June 23, 2011 at 02:41 AM.