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Try to seat no more than .010" off the lands with an A-MAX. Use a Stoney Point. At the very least, use the black felt marker method. In my experience, most chambers require more than 2.800 overall length to achieve this with a 155 A-MAX.
I was geting 1.312" at 100 yards with 42.0 gr varget hornady match brass and 155 amax's. I am working up in .5 gr's till I get to the sweet spot. I did seat a .010" off of the lands, but I was talking to the range guru and he said more air in the cartridge the more compression when it goes off and that compressed air disturbes the powder burn, and he has gotten good results with recommended coal's. So I figured I would try it. At the very least groups open up/close/open up, and then I play with oal?
Thanks Mark! I am doing so. No more playing with oal's 2.800" and work er up. I am at 42.5gr and climbing. My remmy takes a good 6 shots from dead clean even with a jag and patch to get as much oil out as i can to start shooting great. Anyone with a remmy have a solution? Bore snake and a pass to clean the powder out? or just one patch dry at the end of the day?
Thicker so your gona have to load back a bit, and check for pressure signs as you work up. Chrono somethings, but others might have real world experience so what components are you gona use? and the rifle.