Sir, FWIW, in my own experiments with cast 250s and Unique, 8.5 grains and 10.0 grains were the sweet spots for accuracy. The 8.5 load is a bit hotter than a plinker, but by no means unpleasant. 10.0 is about a "three-quarter throttle" mag load.

Hope this helps, and Semper Fi.

Ron H.

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Wishin' don't make it so.