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homefront · November 22, 2012, 01:25 AM

Some published info on reloading .40 Smith brass to .357 Sig:

"The .357 SIG headspace is determined by the shoulder, not the case mouth, just like the .400 Cor-Bon and virtually every other rimless or rebated rim bottle neck cartridge. Probably why people have frequently and successfully used necked down .40 S&W brass to make .357 SIG cases, even though the .40 S&W is over .020" shorter."

http://www.realguns.com/archives/001.htm

And:

http://www.realguns.com/archives/112.htm

November 22, 2012, 01:25 AM	#43
homefront Junior Member Join Date: November 11, 2005 Location: Perkiomenville, Pa Posts: 13	Some published info on reloading .40 Smith brass to .357 Sig: "The .357 SIG headspace is determined by the shoulder, not the case mouth, just like the .400 Cor-Bon and virtually every other rimless or rebated rim bottle neck cartridge. Probably why people have frequently and successfully used necked down .40 S&W brass to make .357 SIG cases, even though the .40 S&W is over .020" shorter." http://www.realguns.com/archives/001.htm And: http://www.realguns.com/archives/112.htm Last edited by homefront; November 22, 2012 at 01:37 AM.