I'm at 46.5gr of 7828 and I use the short cut version. Also have 43gr H4350 with a 95gr Ballistic tip. 43gr IMR 3031 with a 55gr Ballistic Tip is a smoking varmint load for me as well.
Finally got to the range. The big gain was getting to a decent COAL, using 2.650. Shot 2 groups of 3 shots at 100 in 15 MPH wind. Both were cover-able with a quarter, measured 3/4 inch. Ended up with 45.5 7828. The owner, my brother, was really happy with that, so I am going to stop tinkering. Thanks again for the help and advice!
Hardpan