Re: Rifled Choke Experience??
I've had a little experience with them.
Remington 870: I admit I have not spent much time testing with this but I find that it does help slightly,... or at least doesn't hurt my grouping with rifled slugs (Remington Sluggers & Federal Truball). I admit I have not tried any other loads with this gun as these work well and are cheap.
Mossberg 500C: I have not tried a large variety of loads with it but I can assure you that Hornady SST's will keyhole inside of 50 yards using a rifled choke tube. Admittedly these are not meant for rifled tubes but I thought I would give it a shot, I like to see things for myself. I had difficulty finding lower velocity sabot loads for 20 gauge last fall when I got the choke so I have not done much more testing on these types or rounds. With rifled slugs, Remington Sluggers and Federal Truball, I had slightly better groupings over the modified choke but nothing really substantial.
I've really been wanting to try some Buckhammers with it as they are supposed to with in either rifled barrels or rifled chokes. I could not find these anywhere for 20G and I'm not sure they are still being made as they did not appear in the Remingoton catalog.
Despite having the rifled choke available to me, I'm still using the modified choke in my gun for bear hunting.
Overall I didn't see enough of a performance increase to recommend a rifled choke tube. Perhaps if I had more time to play and try a larger variety of loads my opinion would change. If you want to substantially improve performance over a smoothboore I would just recommend getting the fully rifled barrel.
The guns used in testing were:
Remingtnn 870 Express Magnum. 21" (I think) turkey barrel and just the front fiber optic sights. The choke was a std length Remington Rifled Choke tube.
Mossberg 500C with a 22" turkey barrel equipped with Williams Fire Sights. The choke tube was a Carlsons extended rifled.