I have a replaced 22" 6ppc 1:14 barrel that came off my Stolle Panda,.308 bolt face) that should have a lot of varmint hunting life in it. As I can swap barrels, this would give me a chance to shoot my benchrest rifle more using another barrel. What are the options to re-chamber this barrel and have an interesting varmint rifle? I am partial to the 6mmBR case but would consider other options. Thanks, Woodman