Tuning Disco barrel upgrade

 I've had 2 maximus rifles, cant shoot as well as once upon a time (didn't even mount anything above 12x) bot both seems to group well at 30 yards. Both have what I would call Tight barrels/chokes which engrave rifling deep enough into the pellets true long range might have extra drift? True target I just dont know, I still shoot better slightly groups with an old AA410 -LW-. And the current 11mm LW's seem pretty nice if your able.



John