I have been shooting a 17 AH, the wildcat it came from for many years. The first thing I`ll tell you is that when working up a load for it increase powder charges by no more than 1/10 gr. Pressure in this small case go from safe to boom very fast. I shoot H-4227 powder and get excellent accuracy. You can get a little more velocity from Little Gun powder. It`s a great round for groundhogs and down.