Hello i inherited this from my dad . he had a box of ammo . I did some research and found info about case swelling being considered normal ???? My brother shot 2 rounds with case swelling and bolt was binding on extraction on third round it split case upon measuring chamber there was significant taper . I didnt write measurements down but with a round in chamber it is loose enough you can wiggle round . My question is there a round that it can be rechambered to that is modern and easily accessible .thanks