I have a .45 Colt/.410, "Super 14" Contender with the ventilated rib. I only recently purchased it from a forum member and haven't shot it a lot but I think it is going to be a lot of fun to play around with. It throws a decent pattern at 25 yards using 3", Federal, 7 1/2's, so it should be effective on grouse at that range - maybe further on rabbit and squirrel. I was anxious to see how it would do with .45's so I picked up some Winchester, Super X, 255 grain, LRN's and headed out to the range again. It was windy and around 15 degrees that day so I only shot a couple five-round groups from the 50 yard line. Groups were around 4" but I think part of that was due to the less than precise, brass bead front sight. I picked up an inexpensive set of fiber optic shotgun sights that are said to "fit virtually any vent-ribbed shotguns", and am going to try them to see if I can get a little tighter group. I also have a set of dies, a 300 grain mold, and some 9.3 X 74R brass on order and am going to experiment with those. Some have reported pretty good accuracy with handloads using a heavier bullet and the 3.47 inch long brass. All in all, I think this barrel is a keeper.