What game will you be loading for? I have a 26" inch Rugerr M77VT and a 24" Howa 1500. Both shoot the 70 grain Nosler Ballistic Tip extremely well. I use them for coyotes. Both guns will shoot under 1/2" with 47.5 or 48 grains H414, or 41.5 grains Varget.
100g SBT, 43.5g IMR-4831, RP case, CCI BR-2, 3000fps, .5 MOA to 525 yards.
The NBT's are coyote/varmint loads and make short work of them to 500 yards...The Sierra Gameking is a deer load if I was to ever take the .243 deer hunting...