i have a 25-06 that is a classic sporter. My smallest 100 yard group I have ever fired in my life was measured .040" 3 shots center to center. This was with the 117g SBT bullet and 53g H-4831. To prove this was not a fluke, because it looks like 1 oblong hole, I loaded it up once again. It shot .250" with the 3rd opening up the group a little more. To further prove it was a good load, I did a 5 shot group and 4 went into .2" while the 5th opened it up to .5" All I did was adjust the trigger. Nothing more. Also shoots 2 other bullets, the 110g AB, and the 100g SMK, under .5 at 100 yards. I dont know if I got lucky or what, but I have no problems whatsoever with my factory barreled Winchester.