The T inside of a circle is the stamp fot Titanic Steel barrels, which is not a variation of composite steel barrels. What you have is a T with a crescent above and a crescent below. This is the mark for Twist barrels. Twist Steel barrels are very strong and the vast majority of hammer guns had a variation of Twist barrels; Twist or Twist Steel.
Have them measured for adequate wall thickness and chamber length.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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