In one of the "Everyday Sniper Podcast" Frank mentioned that a student of his was having trouble with his groups at the Alaska course. The cause was a poorly built suppressor. I think that I have run into a similar issue with my Silencer Co Hybrid. My MPA .338 Lapua - 300gn Bergers at 2720 ft/sec groups really well (0.3") with a muzzle break. I tried the same load with various seating depths with the suppressor and cannot come close to this group. I'm gonna try again with a borrowed Thunder Beast suppressor, but was wondering if anyone has had a similar experience. My guess is that there may be too much turbulence caused by the .46 end-cap or poor barrel harmonics.