My 270 WSM
likes 130 gr Win Ballistic silvertips. Best group, so far, is 0.875 inch @ 100 yards.
Others tested are:
Rem CoreLoct 130 gr, 1.3 inch
Win Power Max Bonded, 130 gr, 1.9 inch
Federal Power Shock 130 gr, 1.67 inch
Win Super X 150 gr, 1.45 inch
Federal Premium, 110 gr Barnes TTSX, 2.1 inch
The rifle is a Win Mod 70 Classic Featherweight, New Haven, with an aftermarket Canjar trigger adjusted to 2.5 lbs.
Your mileage may vary.
Unfortunately, I haven't chronographed any of these factory loads.
Artillery lends dignity to what would otherwise be but a vulgar brawl.