5mmgunguy. I sent you a pm, but you may have missed it. You say you had Corbin make a couple of sets of dies for drawing down the 20cal to 19. Do you mean by set, that there are more than one die for this job? I have Rick's old die here and it works fine, though I stick with the nosler bullet. I am currious if you are doing it in two steps.
Ken, I use both RL-7 & 4198 (AR 2207 ) in my 19 abdger, both at 15.8 as per Jim's instructions. You could load 20 of each and mix them all up, you could not tell the difference. In my rifle perhaps RL-7 is the tightest, but I don't shoot well enough anymore to pick the difference. From the first rounds I put through it the rifle has never shot worse 0.450, and thats down to me.
Rl-7 probably runs better through the powder thrower. We can't get Accurate Arms powder over here
Johno