Pattermaster code black patterns

[Canamkayaker]

Anyone have any experience with this choke in a 870 SM? Just curious as to what I should expect. I shot LB 3.5" #6's this spring. I experimented with different shot sizes of the LB 3.5" but haven't ventured far from that. I plan to do more tests before I decide to upgrade on guns.

Thanks in advance

[SKFOOTER]

I use it in my 11-87 Special Purpose 3" w/21" barrel and it shoots lights out with Hevi Shot #6.

[Canamkayaker]

Thanks for the comment. I need to do some experimenting with 3". I've always just went 3.5" cause I could. But I see a lot of good results with 3's on here