This is my exact reload also. I love it.I use 21.5 gr green dot, Winchester primer,down range gold fig.8 wad.love it from 27yd line.
This is my exact yardage load with 20.0 grns.Alliant used to publish data for Fig-8 and W209 primers. Here is the data. STS or GC hull, W209 primer, Fig-8 wad and 9/8oz shot