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Put a caliper on those bullets! They look suspiciously like pulled steel-jacketed (magnetic) Chinese milsurp silvertip 7.62X54R. If so, .310 is not good for a .308 bore. As to exploders, Velex/Velet back in the 70s made so-called handgun exploders which used some form of sealed percussion cap over a powder charge in the nose of Sierra Jacketed hollow cavity bullets. Due to their sudden disappearance, I suspect that Sierra might have convinced them to just "stop it!"