I hope you pulled the sako ammo and reloaded it..MAYBE the primers were deeply seated..havent struck it in centrefire but have done with .410 ammunition... short fireing pin and deep seating doesnt work. did have some issues years back with my zastava and it put me off ccci primers for a bit UNTIL a mate showed me how to release bolt tension/spring tension for storage....leaving your BLR with lever open would in effect leave spring compressed...MIGHT have contributed to your issue.
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