I don't have that much experience in shot pattern, but the Cutts Compensator system could either have an adjustable choke, or multiple fixed chokes that you need to use a wrench to swap out. I have fixed skeet, modified, and full chokes for a Model 12 with this, plus an adjustable choke.
The problem with the adjustable chokes is that the 8 'fingers' that make it a choke can each be broken at the inside base, and this is something buyers need to know to look for.
Also, I would definitely NOT trust the adjustable chokes for anything other than lead shot.
I have not gotten it yet, we will see if I get it or not. But I really appreciate your sharing the information, very interesting.
Glad to help!
One last point: Cutts made both steel and aluminum Compensator cages and chokes. I wouldn't even consider trying the aluminum choke/cage setup with anything other than lead shot. In steel shot, I might try the steel fixed choke- but I'd follow the usual adjustment for fixed and steel shot: If I have steel, I'd use nothing tighter than a modified choke, as that would become like a full. And, I'd keep to steel shot sizes of 4 or smaller.
If you go to shotgun world's forum, or doublebarrel gun forum, you'll find a lot of people who say NEVER fire anything other than lead through these barrels- whether it has a Cutts choke or a fixed choke- due to the steel the barrel is made from. However, you'll also find people who will share that they've had no issues for years with steel and the fixed barrels- as long as they kept shot to 4 or smaller.
IF you can afford it and want a piece of history- they are cool and work well: as long as the bolt/receiver interface isn't battered and the foreend is snug on the receiver. The forend can be adjusted to some degree with the existing ring, or a different ring can be fitted and adjusted, to tighten up forend/receiver fit. Battered receiver/bolt requires skilled welding/fitting.
IF you can afford it as a second/third shotgun, you should have a blast with it.
As an only shotgun, I am hesitant to recommend them over a modern barrel/receiver design that works with steel shot, you can find parts for, and that you or a local gunsmith can work on. Model 12 trained gunsmiths are like Colt Python gunsmiths [original v-spring, not new coil spring]: hard to find.