Discussion Starter · #1 ·
Does anyone have an idea of the cup pressure of light ball ammo vs heavy ball? I am asking for a general measure not specific to any particular mfgr.year or country. The hungarian light ball load shoots wonderfully in all my Mosin rifles (no extraction or sticky bolt)... but any heavy ball in the same rifles will cause me to reach for a 2x4 to beat the bolt open and quite often tear the rim from the case. Is there a significant difference in velocity or chamber pressure between these different bullet weights? I am curious about surplus ammo (have not fired any commercial loads yet).