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basically, as I understand it, they bore out the muzzle a little bigger than the rest of the barrel, to correct for severe muzzle erosion. I guess you could say that the counter-sink the barrel back to where the rifling is still good. should be easy to tell whether it's been done, and shouldn't effect accuracy much, so far as I can tell.
The idea is to cut away the worn out rifling at the muzzle. If the worn out rifling was what was causing inaccuracy, and the counter boring is done correctly, accuracy is ENHANCED.
If the rifle has other problems, bad bedding, lopsided chamber, bad trigger; or if the counterboring is botched, accuracy will be not so encouraging.
I just found out my M-N I bought is counterbored. I don't see how it would be any different than having a muzzle break or some other doodad mounted on the end of your barrel that has no rifling. You just get a >wee< bit lower velocity, and whoever made the rifles saved a few bucks on a new barrel.
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