So far, the most accurate factory loads have been the Federal GM2232M3 (77gr.), and more recently, the Black Hills MK262 Mod 1 (77gr. OTM) and Stan Chen (ASYM) 75gr. OTM... in both 1:8 twist polygonal 3R and 1:8 twist 5R, both with Wylde chambers.
I've got some 77gr. ASYMs on order, but they are back-ordered for now.
Shoulder Drive Nicholson Club