From T/C catalog No. 15 (1988):
New Englander in .50 or .54 (1 in 48 twist)
Also, Pennsylvania Hunter 1 in 66 twist ".010 CUT rifling."
Additionally, accessory round ball barrels for Hawken and Renegade 1 in 66 twist ".010 CUT rifling."
And, Cherokee in .32 has "1 in 30 twist", in .45 it has "1...