The only bullets I’ve had to jam were some vld type,like the nosler rdf junk. As far as the amax is concerned every rifle I’ve ever loaded them for shot best with a 20-30 thou jump. I’m referring to 308 due to that’s the only amax left.
I establish chamber length using a dummy round and always seat according to the length from the landscape.
Try a 20 thou jump and work from there.