Hodgdon has load data for the 6mm Remington and shows 48 grains under a 100 grain bullet as a compressed load and at 48,000 CUP.
With my Ackley I am at 48 grains and am having a soft brass issue. I got this brass in bags and it is older, there seems to be a couple slightly different headstamps, some of them show extractor marks for no reason when the primer is fine:This is with RL 22 but it is pretty similar, 45 grains is a lightish load and it gives me the most pressure signs. Stars denote the most evident signs and the slightly different headstamps.
Can I continue in the 6mm Ackley until I recieve primer flattening, or I get a really compressed load? Is anything hurt by lots of compression of powder? I am already nearing the case neck, and then a 105 Amax on top of that goes into the powder some. Much more powder and I believe it will be in the case neck before bullet seating. Is that a no-no?