I used the Carlson rifled choke tube in my Win 1200 28" vr barrel and was able to get 3" groups out to 75 yds, 100yds was stretched out slightly opening up to around 5".
This was using Winchester 2.75" 1oz slugs.
I installed Williams Fire sights that clamp on to the vent rib. The RCT gave a slight advantage over the IC choke tube I was using.
I've since switched to a Rem 870 Sure Shot with rifled cantilever barrel and shoot Slugs r US SPW's.
The Rem Sure Shot came with a turkey barrel and turkey choke, I had a Rem rct for it but haven't needed to use it or try it out since I have the fully rifled barrel.
Last edited by Sgt Recoil; 09-13-2017 at 11:27 PM.