Took the WR 500#2 out today. Fired 3 sets of 4 rounds.

#1 136 grain BP with a 380 grain bullet.

#2 134 " " " " 425 " "

#3 126 " " " " 515 " "

The 380 grain were all over the place at 50 yards.
The 425 grain were an improvment with the left barrel placing 2 shots within 3" but the right about 7" apart and 10 lower. (Part of the horizontal placement is me finding where to hold the bead in the notch. I believe I now have it figured out.)
The 515 grain was an improvment again. I have one flyer. It went off before I was ready. They are at least on the same horizontal point with about a 10" gap between the furthest left and furthest right.

https://i.imgur.com/m7UhVmU.jpg

I think that I will concentrate on the 515's and start making small adjustments. Barrels had no powder in them and were surprising clean.