Have a wee read at this link Toby.
http://www.border-barrels.com/articles/bmart.htm
There is an elementary explanation of most of the top barrel makers techniques in an easy to read format.
Well worth turning into a sticky on a reloading/ ballistics page somewhere.
When I get back to work I'm going to print it off and keep it in the orchard workshop as I'm always forgetting who is using which cut process in their rifling manufacture.
Bookmarks