what does rifle do with other ammo??? federal blue box 100grn???? will give you benchmark..... if you starting from fresh you could be chasing your tail...presume you have done all the other checks...scope,mounts,bases,action screws,stock not doing funky things, have you tried shooting group with other hand on the magazine rather than the forestock??? resting on soft rolled up jumper etc....
we had no issue getting group with older BLR just tight chambering with reloads....
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