I've been spending most of my time at 400, thinking 200 was pretty much dialed in. The problem has been that my groups opened way up at 400. I normally load 73.0 gr but brass isn't lasting and any more than 73gr will leave an extractor pin mark on the head and tight bolt. I'm shooting 180 Berger hunting VLD's, .015 off the lands. 400 yards front bipod and rear bag cold, snow flurry, no wind shot low charge to high, twice thru RL-25, 215 primers once fired brass, no body sizing, shoulder touched but not bumped I'm thinking 71.5 to 72 is where I need to shoot another string?