My worst one for case stretching was a Pre-64 in 300H&H. If I full length resized perhaps three loads before the ring was really apparent. Got a Lee neck size die and never had another problem. Of course I only used that brass in that rifle. I just got a Model 53 Jet, and got some PPU ammo. Only one reload so far but no issue, and after firing no case stretch. The overall length was still within spec. Hoping they work out as they are the only game in town for 22 Jet brass or ammo without buying ancient stuff for a bunch of money.