I figured this round is common enough to post here...

I've been working up loads for this gun. 223AI, 28" fluted bull, 1:8 twist. I've got the 55 gr V-maxes shooting great but I am having a tough time finding a load for 75 gr A-maxes. To get decent groups I have to slow it down to around 2950 fps using Varget. I thought I had a good load using Benchmark powder but when I tried to reproduce the groups they almost doubled in size (~0.300 to ~0.525") at 3050 fps. It seems to shoot the light bullets great, but the 75 A-maxes have been giving me fits.

Are there any "go-to" loads for this combo? It's throated long. I can seat to 2.440" before touching the lands.

Thanks.