I go down .004 from .264 t0.260 for my 6.5x58 Rimmed Sauer. They work very well but I don't think I would want to go much more. I talked to a few that have gone from .323 to .318 for their old narrow bore 8mm's.

After the first shot the rest are just noise.

Make mine a Minaska

Heaven has walls and rules, H-ll has open borders