I really liked the BM3 in a couple of my rifles. The White Ultra Mag really seemed to get along with BM3. The only problem I had was the first shot would never hit where the next shots were hitting. So I tried a lot of things to try and change all of that. Granted the difference at 50 yards was not much, but I like them to shoot right where I aim. This was some of the groups I shot using a .504 diameter 460 grain pure lead conical. I was more then pleased, but again I had to fowl the barrel to make it work.
I then tried something others had talked about and that was seeing how the rifle behaved when you used Sheath in the barrel and did not remove it. Others have suggested bore butter for the same purpose.
Here I tested some different powders with Sheath as my buffer for the first shot. I cleaned the barrel between powder changes. I was kind of happy with some of the results.
Its just a shame I had shot off all my BM3. APP 3f and conicals just did not agree. The Triple Se7en 3f and Goex 3f really did well as usual. I am not really sold on the BM3 though. I can get just as good of accuracy out of different powders. And of course for a lot less money. Although BM3 has to be one of the easiest powders to clean out of a barrel. It's right up there with Pinnacle and APP. Clean and swabbing is all part of the sport of shooting. If I have to swab, then I have to swab. If I don't want to swab, all I have to do is hunt with the White and some conicals...