7.62x54r - split shoulders question
Only have had time to goto the range once with my 91/30 so far.
Fired 50 rounds of Surplus thru it, then cleaned it thoroughly.
My question, before I start shooting the brass cases and reloading those:
Out of the 50 surplus rounds, which look like 50's manufactured,
am guessing either Czech or Bulgaria, light ball fmj's, steel copper washed.
Maybe 5 out of the 50 had split shoulders on them, so 10% ratio.
Still have another 50 rounds of surplus that I'll fire next time and see.
I was having sticky extraction, so I really cleaned out the chamber,
and will be taking my cleaning kit next time to hot-clean it after firing a few.
My question is: Could there be a tiny burr causing the split?
The other ones that didn't split, I did not notice any weird marks on those
shoulders, but they're all pretty dinged up anyway.
Or is this just the result of 50-ish year old steel ammo and to be expected?