Finally got out and shot today.
257 Weatherby Vanguard 2, 26" 1:10, Fed 215, 3.173 COAL, Nosler brass 67 gr. Shock Hammer
IMR 4350
70 3776
71 3918
72 4024
73 4074
74 4119
75 4266
Didn't really find the limit but this group was all over the place , mainly vertically, don't think I'll waste any...