Best load I've worked up:

Winchester Case
70.0 gr IMR 4831
180 Grain Nosler Accubond or Ballistic Tip
Fed 215 Primer
3.332 OAL

This produced consistent sub MOA groups out of a Winchester Model 70 Classic. Best three shot group I've shot at 100 yards is .424".

Another load I like that gives consistent MOA performance:

Winchester Case
71.5 Gr Reloader 22
180 Grain Nosler Accubond or Ballistic Tip
Fed 215 Primer
3.332 OAL