.40 Rice barrel, 38", square rifling, .395 ball, 40 grs 3F. Need advice on interpreting these patches. Gun is recent build and shooting well @ 25 yds but it loads almost too easily. Could I try the denim with this .395?
IMHO - the crown might be where the cutting of the patch was taking place. Smoothing the crown will help. The barrel maker's machine cuts at the muzzle always leave sharp angles/corners.
Those tend to cut the patch when loading. I have a brand new .36 cal Rice barrel with square cut rifling. It has never cut a patch and I've been using normal .022" denim and .350" balls. If
I had a .355" mould, THAT is all I would use. The DC mould I currently have, is an Ohaus (maybe RCBS) mould I purchased in 1978, I think.
Good condition .40 calibre barrels, if smoothly crowned, load easily with even .400" balls and the same .022" denim patching. A .395 is a piece of cake. These small diameter balls are more
easily formed into the rifling (if pure lead) than are larger balls like your .58 uses as there is less lead to move. They form/conform easily. Time and again, I have demonstrated in my .32, .36 and .40 cal. barrels of not having to use a short starter to start those balls. I place the stud on the starter or even a choked up rifle's rod, and pushing the ball into the muzzle. In they go, then down the bore with a couple pushes on the rod. I like to choke up on the rod and only push 10 to 15" at a time. Then. slightly lift the rod off the ball, and down another 10 to 15" until seated nicely and firmly on the powder. Slight compression of the powder is necessary to get close shot to shot velocities.
Taylor has used more Rice barrels than I have, however, no matter the make for me or him, our patches have never been cut by the lands.
If there is cutting going on, it is at the muzzle, usually unless the bore is very rough. I've never seen that in a new Rice barrel. What I have seen, is sharp cornered machine cuts
usually about 45 degrees. Rounding those corners will prevent cutting on loading.
The outside fraying is not caused by the bore. It is caused by the muzzle blast on a fairly loose weave that does not have a lock stitch, like denim. See the brown marks out on the
outer 1/8" of the cloth? That is scorching from gas-flame blow by.
The black is fouling/some heat-burning, the brown is scorching - blow by. Eliminate the scorching and cutting at the muzzle and you'd got it made. a sligthly thicker patch is warranted, imho.
Try smoothing the crown and as well, the denim you've been using in the .58.