Interesting thread and information. I stocked up on 25-35 brass on ebay when I first got my rifle in 2006ish. But because I can, I made some brass from 30-30 Win. Don't remember where I read it but it stated you should step down from 30 caliber to 25 caliber with an intermediate step. Since I had a set of 7-08 dies used those. Worked like a champ and I didn't loose any cases. They all did have small vertical dents just above the shoulder but I never fired them enough to see if they caused an issue.

Thomas