I have been trying to transition from the 300 SMK to the 300 Berger in my 338 Lapua. The SMK is a very consistent performer. I’ve verified the load well under 0.25” at 100 yards numerous times. Under 0.5 MOA at 1000 multiple times etc. This is with 91.5 grains of H-1000, GM215M and a 0.080” jump to the lands. I am at 2785 fps with single digit ES. I’m down to my last 80 from a 500 ct box and have been trying to get a Berger load dialed in with marginal success. To date, my best at 100 yards is 0.750”, best at 350 yards is 0.67 MOA and at 1000 yards it’s about a 1.2 MOA rifle. At a mile they shoot about twice the size groups as the SMK. I’ve checked run-out, tried a clean barrel, dirty barrel, CCI250s. I’ve tried loads with H-1000 from 2680 fps – 2820 fps and Retumbo from 2710 fps - 2845 fps with no real indication that one load is better than the other. The ES is also about double that of the SMKs. I’ve tried jumps from 0.010” to 0.100” and nothing seems to make improvements. They are also about 40 fps slower than the SMK with the same powder charge. My understanding is the reduced baring surface would give an increase in velocity. This is all out of a 28” Lilja 10-twist barrel that has a total of 635 rounds down the pipe. I had high expectations for this bullet. Will some rifles just not shoot these things? It will be a big disappointment if not since I have 1500 of them. What am I missing? Thanks.