when you get past 300 yards the extra weight helps,an example, I have 2 7mm rifles,one is a 7mm stw, it weighs 8.5# ready to hunt, the other isa 7mm Allen mag, both have lilja 9 twist barrels, both will shoot sub 1/2" moa at 100, the stw will not break 8" at 750 yards, the 7mm AM will do 3", the 7mm AM weighs 14#
RR