I have a Brazilianicon Mauser looks like the last 2-3 inches of the muzzles rifling is worn to nearly nothing. Not sure on this depth as currently only got a broken wrist and trying to work out how much of the muzzles rifling is worn.
Questions, can I counterbore upto this depth, what dia should I counterbore being such a deep counterbore and what is the prefered method to carry out this proceedure.

Myles

---------- Post added at 07:03 PM ---------- Previous post was at 07:01 PM ----------

What is the best way to work out how deep the wear is.

Myles
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