If I'm not mistaken, the idea is to fix a rifle whose muzzle has somehow been damaged, without rebarreling the action; a governmental economy measure. Yes? I think what I want to know is two things. First, does counterboring appreciably affect the accuracy of the weapon? If so, which way? Second, is a counterbored rifle more or less valuable (and more or less pricey) than one that is not counterbored? I'm thinking about adding a Mosin M38 to my inventory (I can't really call it a collection yet), and it seems like all the ones I see in online stores or on auction sites are counterbored. Can any of the Mosin shooters here advise me if a counterbored rifle is a good shooter and a good choice?