Jfal
Professional
Fair enuf Hans, but on the Ronin, the Hood touches the breech face, thus the 2 measurements would be the same (at least with my super-accurate hand-held ruler up to 1/16". No idea if the hood rests on the breech with other modelsNo; your barrel is measured with the action closed from the muzzle to the breech face; usually with a cleaning rod or dowel.