I just went out to the range today (even though it just snowed 4" and I don't have a 4x4) and tested loads. I had only had 15 rounds down the barrel before that. I loaded 37.40, 37.50,37.60,37.80 and 38.0 The best one was 37.60. Shot a .450 group at 150 yards. I am going to do some more...