Also Stan, distance is not the only consideration for tight chokes. My live bird gun is set up .030 and .040". We start at the 32 yd line. I would call this gun full and fuller. Distance isn't the reason this gun is choked this way, the reason being if I hit the bird I want it to DIE. Pattern density my friend, not distance.
No argument there, buzz, with the caveat that density PLUS pellet energy, is what kills. I have stated that myself here many times. But, box birds is almost unique in the shotgunning world. It is the about only time where we want to kill dead at any cost, that cost being an inedible bird. We aren't going to be eating the nasty things anyway, eh? Aside from box birds, card shooting, and turkey hunting, distance is THE reason for tighter chokes.
One way of looking at it is this: At what distance does a full choke pattern equal the aforementioned cylinder pattern at the 30 yards mentioned? I think cylinder at 30 yards is stretching things a bit, myself. I'd prefer IC there. But, if you think that a cylinder pattern is adequate at thirty yards, pattern that cylinder at thirty yards and then put in the full and keep backing up until you get to the distance that the patterns are roughly equal in density and diameter. I think it will surprise you.
All my best, SRH
