Barrels ring bulge or burst from all sorts of reasons not connected with shot material . I found the Roster article interesting and thought provoking. If people don't want to be thought provoked, don't even look at it.
My own personal experience with shooting steel shot from vintage guns is limited, but it is intriging. I've shot some small shot steel, 7 shot , and about a box of No. 6 from an IC bored 12ga Parker with thick barrels and many boxes of all sizes from my old Mod 1912 12ga with Mod choke and nickle steel barrel. I never noticed any problem, no erosion, no streaking, nothing different. When I heard what Roster was saying about he developed the sturdy shot cups for Remington that fully protected the barrel bore, it became more interesting. That's my experience, others may have different experiences and people will make their own decisions.
If a person is tired of the discussion and their headbone is hurting, well, you know, maybe they don't need to read it? Just saying that there are alternatives.
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