I tried three different 150gr Sp bullets today (Hornady, Prvi, Sierra). 41gr of 3031~2500fps, 75 Yards
I only had time to shoot one group with each bullet.
All three bullets put the first two about .5" apart, but it seems to like the Sierra bullets best:
0.67" - four shots. Could be luck, but I'll take it until I get a chance to shoot more.