Fire-forming 357 SIG Brass to 40 S&W?

[GunnyUSMC]

I may accept your generous offer. And, since it's a Christmas gift, if you don't mind, I would like to gift to other members some 357 SIG as a forward from Gunny.

Just PM me your shipping info.

 

[kcofohio]

Thank you @GunnyUSMC !

Happy New Year to all!

 

[BigBlue 94]

Seems like a similar process to making 357 Herrett from 30WCF. Annealed brass is your friend. As are gradual expansions, not all at once.

 

[BreechFace]

Haven't got a chance to look through my 40S&W for some nickel. But came across this in case you want more.
https://www.diamondkbrass.com/.40-S-and-W-NICKEL-500.html