Longknife - I have just put a light down the bore and it appears to twist 1/3rd of bore in 24", so 1 in 72"?

Daryl will know more about twist rates re: conical or round ball, I take it this is for Round Ball

Quite early I think, the grooves appear almost "Hand cut", slightly irregular

Many thanks for the positive comments, always a pleasure with like minded gentlemen

Tony