I haven't read the article yet but does he address the issue, not of barrel scrubbing that most people seem to worry about, but of the fact that steel and other hard shot will not compress where it contacts other shot (as lead will) as well as the constriction of the choke and is only cushioned by the (maybe too thin) shot cup as the shot ball is forced into that constriction? It seems to me that this would be (over the short term) the matter for greatest concern and is the premise upon which the fear of bulging at the chokes (ring bulges) is founded upon? (was that a question?)
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