So i finally cast some pellets and loaded some #00 rounds. I shot it earlier today and holy crap that shit was amazing. Patterned at 25 yards around 20'' nice evenly spaced pattern out of my 18.5'' cylinder bore. Not too tight that your ruining a shotguns purpose, but tight enough that you can still get a decent range out of it. The recoil was very mild (not that heavy recoil is a big deal). The powder i used was slow burning so it really pushes the pellets out rather then slams. This greatly helps the pellets stay in a nice round shape with minimal deforming. So below is the load info if anyones interested. Use at your own risk. But it is a load directly out of a book. Only things i changed was the wad to a tad taller one to suit my higher powder capacity Hull.
26.0 Grains of Herco (#33 powder bushing for MEC)
Federal 209A Primer
Claybuster 12SO wad
(9) .33 Lead Pellets (i added some tin solder to harden them a bit)
Federal 16mm 2.75'' Clear Hull
8 Star crimp
Velocity 1,250 Ft/s