You could try a standard Shockwave in 250 or 300 grain. They should load firm but easy. I do not use the blackhorn in mine, so I do not need that extra tight seal. I shoot a crushed rib green .430 sabot in mine with a 300 grain XTP and get excellent results.

They are sweet shooting as far as recoil, are they not. Also I was glad to hear your results with BlackHorn 209 were the same as mine. When I was shooting blackhorn that first day, I shot Shockwaves and they did real well.

Have you decided on the kind of scope you are going to use?