@Madsenshooter,

The 00 buckshot ball got shaved a bit being forced into the muzzle, with a ring of lead hanging off the rear as it was tapped down 3 inches or so. Wise to the issue of rotation now, I made sure it was driven out carefully, which by the way, was quite easy to do. Easy push with a hardwood dowel.

Barrel was clean and oiled for the test.

Cleaning today after range time, I once again found differences in patch/jag size compared to my 308 barrels, but finding a good patch combination to produce a tight fit was not a problem.

Cleaning with Ed's Red first, to be followed with a borescope examination for copper.