I have only fired 4 of the 25acp cases more than once. There was no noticable expansion and I don't think they ever will with only a primer in them. Midway has the brass for a little less than $11.00 per 100 but you have to add on shipping and an extra $3.00 for a small order ( under $25.00, I think ). That just gave me a good reason to buy more goodies.