Hey everybody, first let me preface this by saying that I know there is a very similar thread going right now by
@DillyJamba about basically the same issue. I started my own out of respect for him. I didn't want to hijack his thread as he works out his issue. Coincidentally, DillyJamba is a member of my gun club and the rifles we are having patch issues with are both .54 Lyman GPR! I've had this rifle for about a year and did encounter some torn patches a while back that I thought was resolved by smoothing the crown.
So this past Saturday I went out to practice for the 100 yard bench match we were having the next day at our club. My load was 70 grains 3F Goex, .530 cast ball, .018 pillow ticking, moose milk for patch lube. The 10 or so shots I took were all over the place, with about an 8" group. I walked out and searched for my patches and every one of them had a tear. I came home and ran some pieces of Scotch-Brite pads up and down the bore, hoping that might smooth out any burrs or sharp lands. Afterwards I doubled up cleaning patches so it was really tight and ran them up and down and there was no tearing whatsoever so I was pretty sure it would be resolved. The next day I shot in the match and did terrible, I was still having the same problem. Yesterday after work I went out to the range to try some different stuff and attempt to figure out what was going on. I tried less powder, different pillow ticking, different lube, etc.. Nothing helped much. Since we have a CO2 tank at my club, I decided to short start a ball and blow it out to determine if it was being torn at the crown. Checked that patch and it was fine. Then I dryballed one, fully seated and blew that out, it wasn't torn either. It appears that the problem isn't with the rifling being sharp. I'm wondering what to try now and why it's happening? Some kind of filler (corn meal/cream of wheat) between powder and patch? Or a wad between? A more robust fabric for patching? Any suggestions would be greatly appreciated as I'll be heading back out tomorrow evening to give it another shot!
I'll put some pictures below showing my patches that are torn, as well as the ones that I blew out with the CO2. Thanks! -Justin