RE: 270 wsm ammo
In the real world there is very little difference in trajectory with the 130/140/150 grain bullets in the 270. I have chronographed the Winchester Supreme loads in 130 grain from my 270 WSM they clocked at 3250 fps while the 150 grain WW Power Points were about 100 fps slower. The most accurate load I have found so far is the 130 grain Sierra Pro-Hunter with IMR 4350 @ 3000 fps. It will shoot 1/2 inch three shot groups with that load. Never even tried to beat that.