.357 Mag Case Sizing

neilin · 03-13-2011, 07:26 PM

I have been reloading .357 mag for a Ruger GP100 without problems. I recently acquired a Smith and Wesson Model 19, and want to shoot my reloads in it. I loaded up 100 rounds. I was going to use my Model 19, so I started to load it with my reloads. A couple of the cartridges would not chamber all the way (about 1/8" shy of going in). Of 100 cartridges I reloaded, over 30 will not chamber in my Smith, in any of the six chambers. All 100 chamber in the Ruger. Apparently, Smith has tighter chambers. I use RCBS carbide dies. Why will the RCBS sizer not size the cartridge case to fit the Smith? My shell holder almost touches the sizer die on the up stroke. All the 100 cases I reloaded have previously been fired in the Ruger.
I would appreciate any thoughts on this reloading situation. Thanks!

03-13-2011, 07:26 PM	#1
neilin Member Join Date: Jan 2010 Location: Clinton, MO Posts: 63	.357 Mag Case Sizing I have been reloading .357 mag for a Ruger GP100 without problems. I recently acquired a Smith and Wesson Model 19, and want to shoot my reloads in it. I loaded up 100 rounds. I was going to use my Model 19, so I started to load it with my reloads. A couple of the cartridges would not chamber all the way (about 1/8" shy of going in). Of 100 cartridges I reloaded, over 30 will not chamber in my Smith, in any of the six chambers. All 100 chamber in the Ruger. Apparently, Smith has tighter chambers. I use RCBS carbide dies. Why will the RCBS sizer not size the cartridge case to fit the Smith? My shell holder almost touches the sizer die on the up stroke. All the 100 cases I reloaded have previously been fired in the Ruger. I would appreciate any thoughts on this reloading situation. Thanks!