I should have been clearer in my post. I have been down this same road. I had that exact gun and tried H110. It did not clean up. I switched to Unique and the fireball lessoned but near the top it came back as in I was afraid I was going to set the overhead branches of the tree on fire type of fireball. It was some years ago but I remember backing down on Unique till I got a good enough load. With that length barrel I do not recommend H110 but a faster powder.