9x25 Dillon

rsnyder55

In sorting some bulk once fired 357Sig cases I found quite a few marked 10mm and necked down to 9mm. They are longer than the 357Sig cases and I assume they are 9x27 Dillon.

Can I trim and reformed them to 357Sig? What other dies would I need to do this?

I was tempted to buy another barrel for my Glock 20C in 9x25 but the dies cost 4 times what other calibers cost.

dcs shooters

I think so. The 9X25 rim is .425 and 357 sig is .424
You would have a lot of trimming to do, .125 difference.

Riomouse911

I dunno if there is a case-wall thickness issue (Like with .45 Super and .45 Auto) so you might want to approach loads carefully in case there is.