I have a Winchester Classic Stainless 7mm RM, with a 26" barrel. I have used a variety of bullet weights but the most versatile and accurate have been Nosler 160gr partitions. Both in factory premium ammo and handloads. I will also say that in the past few years I have migrated to lighter mono metal bullets (Barnes TTSX, Hornady GMX). In fact, I killed a very large Shiras moose here in Idaho a few years ago using Hornday Superformance 139gr GMX bullets. Range was about 80 yards.
For just general shooting in this rifle, I also have had good accuracy with Sierra Gameking 160gr BTSP bullets. I would use them for deer and elk if I didn't have anything else handy. As always, shot placement is key.
Most of my reloads have used RL22 (140gr Nosler BT's) or RL25 (160gr whatevers).