So im building a .219 zipper on an old 336 action and i have a marlin factory barrel. This barrel has never been mounted and was made around 58-60 (information given to me by seller). Im assuming this is a replacement barrel sold buy the marlin parts division. My question is were these short chambered to allow fitting to the specific action or fully chambered, I haven't got a set of gauges yet but im curious is im going to need a reamer to. Thanks guys.