Are 7.62x54r and 7.62x53r interchangeable? Just picked up an M28/30, most things I'm reading say they are interchangeable, but saw something that said using 54r steel cased can cause barrel damage. :
Mauser ~ Argentino 1909 ~ 7.62mmx53 Mauser
Argentinian Mauser Model 1891 7.62X53 Bolt Action Rifle with nice wooden furniture, marked Loewe Berlin. Serial # A1857. - Rocky Mountain Estate Brokers Inc.
Argentine Model 1891 7.62x53 For Sale at GunAuction.com - 5891568