rabbit (or others): Where can I read more about these "old" and "new" American systems of choke designation, including an explanation of the migration of the "Skeet Out" designation in relation to Improved Cylinder, and of In and Out's relationship to the "Skeet 1" and "Skeet 2" terms I hear more often in my neck of the woods. Didn't Winchester use the latter, and what measurements did they correspond to? Thanks. TT

"The very acme of duck shooting is a big 10, taking ducks in pass shooting only." - Charles Askins