I had been getting some very strange fliers on my M92 Rossi as I monkeyed around with load development. The rifle will pattern generally well, with the occasional strange flier blowing up the average.
Last night I put the patient on the workbench and went over everything with a fine tooth comb. What I discovered were two nicks/burrs right on the transition from the muzzle face to the bore. There are in the 11:00 and 5:00 position. They are very small nicks, but significant enough to catch the fibers of a Q-tip as I pulled it from inside the bore to the muzzle. So in my mind, this most likely could be my culprit.
Now what to do.
I'm keen to get some feedback as to when lapping is not enough and re-cutting the crown becomes necessary.
Many thanks in advance.