I am starting a build or two now, one 36 and one 336 from 30-30 to 38-55. Am planning to use Green Mountain barrels, hopefully the tapered octagon#3 contour, 14 twist barrels. Any insight offered will be cheerfully read, and possibly used. These will be the first lever action Marlins I've barreled, I've done a number of bolt and single shots and I've been putting these builds off for awhile. So, let's get started, please and thank you. Jimmy