H110 is NOT a good powder for the heaiver projectiles in this cartridge
My full wadcutters weight in at 725 grains (obviously bullet on rignt) .
AA1680/WC680 is the powder to use for best velocities
My max load is 34 grains yeilding just under 1300 FPS from my 12" barrel. I started at 30 grains and worked my way up. This is not yet a MAX pressure laod, but it is enough for me.
With the powders that work well with the heavy slugs, there is no need for a gas check. I water quench my lead projectiles and get no leading even going past 2000 FPS.
I have since switched to another mold that drops the wadcutters at 700 grains and makes lighter hollowpoints, but I use the same powder charge. I have not re-chronographed the lighter weight projectiles