Here are my test results. I have Chrono data too, but it is late and I am getting tired. I fired 3 shots for each different powder weight at both 100 yards and 300 yards. I was really impressed with some of my 100 yard groups, but I don't think I had a solid enough rest for the 300 yard shots. The closest at 300 yards were the #4 group of 42.8 grains of 4064. #5 would have been on, but I jerked my last shot! I decided to go with 42.8 grains of 4064 because it shot pretty darn good and I figured why push the pressure and charge up to 43.1 when I don't really have too.
In both pictures, the black squares are 3/4".
And finally, how are groups measured? Is it from the center of the holes or from the farthest out? I think I have always measured from farthest out. If it is the center holes, then I am in serious business at 100 yards!