My post disappeared from last night!!
I have a HS .308 fluted barrel. It's extremely accurate with 150 gr. BTs and 115 gr. Lehigh Chaos bullets. They wouldn't shoot the same originally, but I experimented and found 2 different powders that allow them to shoot at the same point of aim. I've taken deer and groundhogs with both out to 400 yds. with my 3-12BPlex. The tiny Lehigh causes a surprising amount of damage for its size.