Bruce,
I think Roster solved the problem for modern high carbon steel barrels.
For older, low carbon and composite barrels Modified Choke is a misnomer. The barrel thickness and choke constriction are key factors.
MOST shooters do not have access to an accurate dial indicator or digital bore gauge and certainly do not have a barrel thickness gauge! We cannot say that steel is okay in a modified choke. That may result in a blown barrel like the .008" failure which you witnessed!
We will test and retest to prove or disprove the hypotheses.
Mark
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Threaded Mode