I picked up a Patternmaster Code Black for my A5, which uses the Invector DS chokes. It's .665. I have a Carlson's Extended Turkey Choke in .665, and a Kicks Gobblin Thunder in .680. I want to try and get it out this weekend sometime and see how they all compare, along with the stock full choke, using some 3 1/2" Longbeard XR #5.
Most of the counties I deer hunt in are shotgun only, and a lot of the time I use 00 buckshot. Pattermaster has a Big Game choke and I'm going to compare that to my Carlson's Buckshot amd Kicks Buck Kicker chokes, along with the stock full and modified chokes.
If I can get out Saturday (it is supposed to rain, though), Sunday is going to be a miserable, sore-shoulder day.