The test this weekend finely paid off.
With 4.6fg of TG, a Winchester 230gr FMJ, Winchester large primer,
OAL 1.240, and a taper crimp .468 (Hornady).
50 ft grouping on sandbag; approximately 1 inch.
25 meter was between 1.5 and 2''.
Very consistent, and I 'll try to refine this...