I have a winchester 1300 w/ a rifled barrel adnd I used to run sabots the 1st yr I had it then they stoped making the sabots the gun and I like so I started using Brenneke MPs it says on the box " BRENNEKE slug M.P. Specifically developed for both rifled and smooth barrels I have shot 2 boxes thought it and the work fine at 75 yrs I' m about 4inches low but still in the kill zone