Hey Jim,
Download the LazerCast load manual for free online, their data with a 125gr cast, truncated cone bullet, 2.9gr Bullseye starting load gave 711 fps and went up to 1000fps.
4.1 gr Unique gave 741 fps.

The 148 dewc will likely shoot better but make use of what you have on hand!

"Camping places fix themselves in your mind as if you had spent long periods of your life in them.
You will remember a curve of your wagon track in the grass of the plain like the features of a friend."
Isak Dinesen