My 300 WSM
factory Winchester with 24" barrel is shooting 190 VLd's to .5 MOA with 61 grains of IMR 4350 and they are 2.860 COAL ( .100 off the lands ) and 2.295 OG. I find this WSM likes most loads out around .100 off the lands.
This gun also shoots .5MOA with 66 grinas of RL19 with a 180 grain ballistic tip at 2.810 COAL.
Both of these guns will hold 1 MOA all the way out to 800 plus yards. This is a factory gun.
Start loads in the middle range of what the books say and work up towards max loads until you see pressure signs.
PS....my gun shot 180 TTSX at 1 MOA at 100 yards, but feel way off as the ranges got longer.