Here you go Snit...

Carlson's Winchester Buckshot Choke (near the bottom of the page)

Shooting a Winny SXP 26" pump ($350) with 2.75 00 buck. I picked that gun because its a tough working tool and I won't feel bad about a scratch here or there when the going gets tough. It can handle getting soaked. It cycles really fast with the auto-blow back feature (3 shots in about 1 second out of a pump, similar to a Benelli Nova). It takes some getting used to, but once you figure out the cadence of the pump, it works like normal. The Carlson choke is extended and ported. It has special ribbing to pull the wad off early and prevent down range shot disruption. At 50 yds (zero), all 9 pellets are generally within the size of an orange (+/- 1"). Occasionally, you may get a single flier that turns the spread into the size of a cantaloupe. I can deal with that. It's pretty amazing and does a MUCH better job than I thought it would do.

So when I shot at the deer at 10 - 15 - 25 yards, it really was like shooting a single slug. I'm certain I shot high.

PS> My SXP also has internal recoil dampeners + a limbsaver slip on pad. With the ported choke, the recoil is like a .410 and almost non-existent. It's twice as loud as a standard non-ported gun. It definately goes BOOM!