The Firing Line Forums - View Single Post - .40 loaded to same as .45 acp = same power?

bamaranger · September 17, 2023, 11:16 PM

Can one drive a 200 gr projectile from a .40 case and not get seriously high pressures? The 200 gr slug will occupy a lot of case space to boot, not leaving a lot of space for a powder charge. None of my manuals show the .40 SW and a 200 gr bullet, loads stop at 180. I suppose a lead slug will give less pressure and no doubt somebody has done it. But, the .40 operates at serious high pressure already.

September 17, 2023, 11:16 PM	#7
bamaranger Senior Member Join Date: October 9, 2009 Location: North Alabama Posts: 8,788	.40/200 Can one drive a 200 gr projectile from a .40 case and not get seriously high pressures? The 200 gr slug will occupy a lot of case space to boot, not leaving a lot of space for a powder charge. None of my manuals show the .40 SW and a 200 gr bullet, loads stop at 180. I suppose a lead slug will give less pressure and no doubt somebody has done it. But, the .40 operates at serious high pressure already.