I've long been a fan of H-4350, it just seems to give great accuracy in any round where it's an appropriate speed powder. So since I had a jug of it on the shelf when I got my first .243, it was a natural choice. I ended up getting rid of that .243, and then got my son a .243 for his first rifle, both rifles are rem 700's.
For bullets 85 gr and heavier I could dial in moa or better groups with little effort and have tried at least a 1/2 dozen different bullets from various cup-core 100-105's, the 87 V max, 85 partition and 95 tsx.
I'm sure there might be a powder that will be slightly more accurate, or slightly faster, but I like to keep my load work simple, and IMHO H-4350 simply works in the .243.
