Each gun is an individual, and it's hard to make accurate generalizations about steel shot and full chokes. Interesting that the proof houses ignore the amount of choke when granting the flour de lis stamp.
Worth Matthewson, writer, duck hunter, and author of "Big December Canvasbacks" wrote that he was shooting a Field Grade L C Smith when steel shot came out. He agreed with the use of steel even before it was mandated, and began using it in the Smith, which was choked extra full in both barrels. He used it for years until taking it to a gunsmith to have some minor problem seen about, and was told he shouldn't be shooting steel in it, especially with such tight chokes. The Smith had digested, and burped, those steel loads for years with no discernible barrel issues!!
