Originally Posted by
wlc
BB, try somewhere around 6 grains of unique. Might be supersonic, but will be close. If I had the boolit data (length, weight, his seating depth, OAL, barrel length, etc) I would offer to run it through quickload for you. IIRC I tried 6 or 6.2 under a 250gr and it was subsonic. Thought I was getting poor groups and switched powder. I found it was a vertical stringing problem with the rifle after I switched. I will revisit Unique if the Am Select doesn't give me what I want with the 250 grainer.