I am a bolt gun guy, so hang with me on this one. You guys have piqued my interest in doubles and I have found an example that I have an interest in. It is a M37A in 500/450. It is a hammer gun, under lever?, that is easily 98% overall. Barrels mint. Would this be a BPE or NE rifle? Would this be a double to start with? I am an experienced big bore reloader, so if components are available, it would be a go. Any estimate on value or advice would be appreciated.