Ive found 58 grains of h4831 and a 150 grain speer bullet over a 215 fed primer in several 270 win chambered rifles to give excellent accuracy
under 1" 5 shot groups off a bench rest at 100 yards consistently, and about 2940 fps in my browning and sako rifles
while Ive only used it on mule deer its proven very lethal, even out at nearly 450 yards on one occasion
https://www.speer.com/bullets/rifle_...t/19-1605.html
some older reload manuals list 60 grains as max, I see no pressure signs but ,
58 grains is the max the case allows and still have the bullet seat to the correct depth.
Id start with 55 grains and work up just to be cautious, and as always cross check at least three reload manuals