What is the oal of the cartridge when the bullet is touching the lands. Try 93 gr. of Retumbo .100 to .125 off the lands. Also 90 gr. of H-1000 at .100 to .125 off . Have you checked the runout on any fired cases? I don't have much neck tension. I have had 10 .338 EDGE barrels and my shooting partner has 2. The Retumbo load shot great in all but one barrel. We have had 3 Lilja's in .338 EDGE and they all shot great and were among the fastest. Gary
OAL with a 300gr Berger is 4.015 touching the lands. I only have a .001 dial indicator and neck runout of a fired case would barely move the needle so I'm guessing a few ten thousandths. My neck diameter of a loaded round with R-P brass is .366. I am going to try a .365 bushing instead of the .364 I had been using.
I have tried 90gr H1000 at .125 off. It shot about an inch at 200 yards according to my notes. The best load I have had was 90gr H1000 with a 300gr Berger .005 off. If I was lucky enough to get a three round group off without a flier, which has only happened a couple times, it would shoot about .25 MOA at 200 yards. I will give that particular Retumbo load a try this weekend. I appreciate your help.