It AIN'T,. the Bullets fault, Bro ! Look,.. elsewhere !
I shoot Berger, .270 Classic Hunters at, almost 3,200 FPS, in my .270 WSM and "Pressure" finally, shows up at, Maximum loads as it's, supposed to.
And the ultimate Hunting Accuracy ( Sub 3/4 MOA ), is slightly below,.. Max.
Barrel / Chamber, "Issue's" could be, responsible ( very, VERY doubtful that, it's the Bergers ).
And,. NOT all BRASS is,.. "Good" some are, HORRIBLE !!! Try using,.. Lap, ADG, Norma.
I'm NOT going to guess, BUT personally, I'd find, a GOOD Gunsmith, to check out, the Rifle,.. FIRST !