I had a custom 338 Lapua built in 2009. I am having ongoing problems with sticky bolt and difficult extraction, even with mellow loads of 87.0 grains of RL 25 and 87.8 H1000 under 300 SMKs (seated -0.040" from lands) that go around 2700 fps out of my 28.5" barrel. From my research, this is by...