One plus about chamber reducers is the extra metal they bring to the chamber area. It can not hurt to have more. I have been shooting full length tubes in Skeet guns for almost fifty years and am very comfortable with them. The chamber adapters are just a shorter version of them in many ways. Like the old Super Tubes used in Brownings in the 1960's. So a proven technology. Those tubes only ran 1/2 way down the barrels and the barrels never suffered any ill effects from them. It is a little odd that velocities are reported to increase with chamber adapter use and that is attributed to less friction between the wad and bore from a looser fit.
