Re: 300 Mag and 210 bergers
I tried .008" off the lands and was not happy with the grouping with the 210 Bergers, ~1.2" @ 100 yards. I was getting 5 shot groups .38" at 100 yards with the Sierra 200 GR. Game Kings. 78.5 gr. H1000 .010" off the lands.
I did some digging in the Berger sight and they recommend .030-.040" off the lands. I have three sets of three to verify but no reason to not believe them. Loading with 78.5 gr. H1000 for my testing. Lots of people shoot at the lands or into them, so use what your rifle likes.
Michael M. Moore
NRA # 166336949