John, I have two shotguns that have after market choke tubes installed (TruChoke) I had this done because of steel shot. I bought a Cation (?) rifled choke tube to try with sabots. It works very well and very accurate. Win. Supreme slugs were the most accurate of all I shot from the bench (ouch). Some years ago the American Rifleman had an article comparing them to fully rifled barrels. As I recall they were almost or as good, memory dims with age. Seldom use a shotgun for deer, but did shoot one adult doe at 75 yds. It went about another 75 yds. and piled up.
