I think I found the sweet spot with this gun. Weatherby 30-378 pushing a 180 accubond chronographed at 3350 fps with 108.5 grains of Retumbo. I turned the necks on all my brass, weighed the brass, bullets, and measured the runout. All were .003 or better. The group size is about .5" at 300 yards. I have 300-400 rounds through this factory barrel and it looks like accuracy is improving. I only had one 3 shot sequence with this load. I am heading to the range in Feb to hopefully duplicate it.