My Hornet which is a 2009 is a 1 in 9 twist shoots the Hornady 35, 40, and 50 grain V-Max's ahead of 12 grains of Lil'Gun like a laser. Groups at 50 yards are clover leaf and less than 3/4 inch at 100 yards. I'm sure they would be better if I could shoot better. Other bullets like the Sierra jacketed soft points shoot alright but nothing to write home about and certainly not as well as the V-Max stuff. I do put a slight, very slight crimp on using the Lee FCD. Some say you shouldn't crimp at all or to use small pistol primers but personally that hasn't been the case for me. One thing I have discovered when using Lil'Gun, is it produces a lot more heat than most other powders. So if you going for accuracy, it pays to allow the barrel to cool a little between shots.
However, trying to find a load for casts has been very frustrating. Though I have come up with some squirrel loads ranging from 1200 to 1500 fps, I haven't been successful getting casts of any kind to shoot worth a hoot with any speed to them. I think a 1 in 12 twist would have been a much better option for the Handi but one has to work with what they have. As for the bore as far as I know, H&R only produces a .224.