I see a couple guys here are shooting staghorns so maybe ya can answer my ?. A friend brought over a staghorn for me to look at but it didnt have a breech plug. By the looks of the bolt it was shooting #11 caps but he wants it conv. to 209s. I looked on different places and found some conversions but for pre 2000 staghorns. What is the difference and how can I tell if this is a pre 2000. Thanks Kerry