The Firing Line Forums - View Single Post - 358 MGP--350 L done right?

Scorch · June 16, 2021, 11:48 PM

ernie8-
The 357 Herrett uses a 30-30 case trimmed to 1.75" long to achieve 2200 fps with a 180 gr bullet out of a 10" barrel. I never tried anything heavier, never really wanted to. The 6.8 SPC case is 1.68", so you might sacrifice some velocity, but running the cartridge out of a longer barrel should get you similar or slightly higher velocities. Right? Do you have to drop down to lower pressures to run these in an AR15?

June 16, 2021, 11:48 PM	#20
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	ernie8- The 357 Herrett uses a 30-30 case trimmed to 1.75" long to achieve 2200 fps with a 180 gr bullet out of a 10" barrel. I never tried anything heavier, never really wanted to. The 6.8 SPC case is 1.68", so you might sacrifice some velocity, but running the cartridge out of a longer barrel should get you similar or slightly higher velocities. Right? Do you have to drop down to lower pressures to run these in an AR15? __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services