I realized tonight, the set doesn’t come with a 25 caliber insert. I used the 6.5 one on my 257 Roberts Ackley with H4831 and didn’t have a problem, but it wouldn’t work with a ball powder though. I used it on 30-40 krag also, no problem with IMR4831 or Western BigGame.
JTD
I don't have a 25 cal so no big deal to me, have you tried it on pistol cases