I ended up with an almost identical 39.7 grains of H4350, which pushes an uncoated Berger 105 Hunting VLD to 3,020-3,040 out of a 23" barrel, on a 70 degree day in Tucson.
Through cartridge or build it's been a bit of fickle mistress. Partly because I had that "It's Lapua brass, it won't need any work" attitude I simply swaged the necks down in a 6BR die with about a .268 bushing. After disappointing trips to range I mic'd the necks and found them pretty significantly egg-shaped. I ended up setting the neck turner to skim about 2/3rds of the neck and my .270" loaded rounds in a .272" chamber now seem to offer less "WTF" shots in a group. This coupled with cutting down the originally 24" barrel to 23" seems to have it shooting more consistently, but nothing spectacular. I've tried hotter charges, different primers--nothing seems to be a magic combo for it.
Will spend more time with it, but for me it's been sort of a "shrug" chambering.
