Just a quick follow-up on the barrels in question. I received the research letter for #5045, and Stock Book #2 lists them as 30" length "Twist Vulcan Steel". [Note that the top rib, as previously mentioned, is engraved 'Stub Twist'.] Chokes were patterned to 140 #8 pellets in 24" circle at 45 yards for both RH and LH barrel.
I've never heard the term 'Vulcan Steel' used together with 'Twist' before. Maybe someone else has seen/heard that particular phrase?
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