I tried a few loads with RL-7, lil gun, and AA1680.
Lil gun was rather dissapointing, to the point that didn't even bother with keeping that data. In the area of 2 inch groups.
I settled, rather happily, on 17.4 grains of AA1680 behind a 50gr Blitzking, sparked by a BR-4. I believe it was a COAL of 1.910. Also equally loved 50gr nosler ballistic tips with AA1680. Both are 5 shots.