I have a Crown 22 on the way from UA. The Slug-X liner is on pre-order though. We are in dead of winter right now so chances are there won't be any range time from me, unless it's in the mid-20's at least and little to no wind. I plan on trying the 19 and 21gr slugs in mine.....should be able to get 900fps out my shorter 500mm barrel easy enough.