I shoot a Weaver Custom 270/300wm wildcat, some of us refer to it as the 270Arnold. I have had good luck with the Barnes TSX140 and 74 grn of RL22 MV=3350fps. 1/10twist barrel and at 200 yds 3/4" group off bench. However out at 500yds I am more than 6" but good expansion and weight retension. Anyone have experience with the .277 Berger 140 grain VLD hunting bullet. Accuracy, expansion and weight retension on real animals close and beyond 400yds?