40 Cal vs 357Sig Brass

[dgod]

I have a tricky question... I recently acquired a bunch of .40 cal brass, amoungst them are several .357Sig pieces. I noticed them after the were deprimed & Sized to .40. In retrospect, I got out my Mic, checked them against the .40's. The 357Sig Case is about .025 longer and about .002 smaller in diameter (.401 vs .398-.399).

Question: How much success could I anticipate loading the 357 Sig cases with .40 cal Data & Bullets? Is it a bad idea? Should I just put them aside until needed? I do have .357 Sig Dies, just haven't loaded any.

Thanks for your advise..

 

[Havok7416]

.357 Sig has slightly different dimensions than .40 S&W. You would be best served using purpose-built brass in this instance IMO. As you've indicated you already have dies for .357 Sig. I would save them for that purpose as .357 Sig brass isn't always easy or cheap to come by.

 

[dgod]

I tend to agree, why take a chance.. Thanks for he input

 

[JimKirk]

What you have found is ...why it is a bad idea to try to make 357 SIG case from a 40 S&W... You found that an "unfolded" 357 SIG is longer than "unfolded" 40 brass ... fold a 40 into a 357 and it becomes too short....