The stuff that I have been using, Hoppes Bench Rest, really did help with better groups, but I have found nothing acceptable, in terms of a load. I worked up to 92gr of RL25, pushing a 180 Triple Shock Barnes X, ignited by Federal Mag primers. This load is only clocking 3200fps @ 10 ft from the muzzle, so it is not hot by 300RUM standards. The best that I can do, is 4" groups at 200 yards. I shoot and let the barrel cool, while I print 2" groups with an old 270Win chambered Mauser. Even my M1 Rifle with iron sights will do better than 4" @ 200 yards. I don't know, maybe I need to have the bore checked out, as it could just be a bad one. I know that the throat is long, because I load right up to the end of the magazine and am still .179" off the lands. Barnes recommends beginning at .050" off the lands, but if I load that long, the cartridges will never fit into the mag! The cartridges touch the lands when OAL is 3.800". I can squeeze in 3.621"OAL and barely have the cartridges feed out of the magazine.