Do a search on the net for .20 practical load data. There is another web site with a real good wright up on this little gem. I have a fluted 22" McGowen .20 practical barrel ready to screw on a Stevens 200. I did the 1/12 twist as all I want to shoot is 32 grain pills. From what I have read they love H4198 powder. The beauty of this round is , you just use a .223 bushing die with a .20 expander and proper bushing. The .223 head space gauge is used for installing barrel. If you p.m. me I will let you know the sight, cause I think it violates the rules. It is also set up so you can touch the lands with a 32 grain bullet.