gewehr76
CGN Ultra frequent flyer
Counterbored mosins are common and they will outshoot non counterbored examples hands down. The reason is if soviets went to trouble of counterboring rifle then it was worth saving and it was a good shooter. After counterbore the crown is sharp and it will give you proper accuracy as oppose to noncounterbored where throug its service life soldiers cleaned it through muzzle end wearing crown in the process.