Here is a group fired with Federal reduced recoil slugs at 50 yards with the IC choke.
One shot barely touches the paper. This is a 5.5 inch group.
This group was fired with the rifled choke tube.
Thats 2.6 inches at the same range with the same ammo. Last three gun match I was at they had an all slug stage. I will be using this choke in those type of stages.
Here are some breneke slug groups with the rifled choke.