I got one last year for the spring season and really gave it a workout.
I didnt find a problem with anything I put through it, but since I was given several boxes of the Rem hevishot I figured I would use them. Great groupings with that and the Winchester # 5's. For the heck of it I really tested it and shot upwards of 60 yards and still got 15 pellets in the kill zone. I couldnt imagine what an aftermarket choke would do. Great Turkey gun!!!!
I also have the 12ga slug barrel which i used this season so far. Great accuracy!! Used Win partitions and boy does it knock em down.
And to you Bullseye, I sighted my slug gun in at first with the Brenneke KO's...$3.50 a box at Dicks sporting goods. They shot great!!!! May be worth a try and give ya a reason to buy the Encore slug barrell:-)