I have a Winchester 1300 with a screw in rifled choke and it works great. I tried several brands of slugs. My gun shoots the Brenneke 2-3/4" 1oz load the best. I can shoot about a 3-4" group at 100 yards with the aid of my scope. Even without the scope I felt confident taking shots at 100 yards. I would suggest tring a few differents slugs. I have heard alot of people like the lightfields, but every gun likes something different.

Good Luck