IPSC Divisions

You can neck down .40 S&W brass in a .357 SiG sizing die but the case will be shorter than proper .357 SiG brass (by 9 to 20 thousands of an inch). Since .357 SiG headspaces on the case mouth it could cause problems.
 
You can neck down .40 S&W brass in a .357 SiG sizing die but the case will be shorter than proper .357 SiG brass (by 9 to 20 thousands of an inch). Since .357 SiG headspaces on the case mouth it could cause problems.

Headspacing in a semi-auto is always a compromise, so adjusting the dies to headspace off the shoulder vs the case mouth isn't a huge stretch.
 
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