I have tried the 140 Partion, and it didnt group well at all. in fact, none of the 140 grainers did well.
The rifle does exceedingly well with leaded 150's.
thanks for the reminder that Nosler uses 26" bbls. Mine is certainly not...
I'm leaning towards 760, just because its one of the powders that is presently available, but again, I'm in no rush.