What's your experience with ...

[TxHuntermn]

This is what that back trigger is for!

Seriously...if you dont completely fold the bird with the tight barrel, thump him again with the cylinder barrel. Stuff some 4’ or 5’s in the right barrel for a swatter load, that bigger shot flys good out of an open tube. You will know if you dont connect with the tighter barrel.

[edgarspencer]

As both Scott and Brian suggest, cylinder bore, i.e. No Choke, can be effective in the hands of a good shootist. 30" circles at 40 yards, may be a method of determining pattern density, but, try a circle which might best represent the distance a jumpy bird might fly at. The best dog may not be responsible if a jittery bird flushes early, but if you're withing 20-25 yards, your pattern test in a 20" circle (about the area a bird occupies, in flight), and your skill to put the shot IN THAT CIRCLE will almost always drop the bird. If you don't consistently shatter clays at that distance, with that gun, pick a tighter choked gun.