RE: I done it again...
With the .451, I hunted with 80gr T7, dry wad, and 460gr NE. Open sites was 4" group - scoped under 2 and I am a long way from a good shot. I plan to work down to 65 gr to see what happens.
The .504's I have not shot much - weather or work. I got both on paper with open sites, holes touching at 25yds with 70 gr T7 - 460 gr NE - no wad. Have to play more this weekend. Have a .410 S91 and a .410 Whitetail in the works.
A lot of the DWB's seem to have great luck with 60 to 80 gr T7 and 400 to 600 gr conicals - with or without wads. Look forward to your reports, cause I am sure you will try others.
Steve