Hey guys, I'm new to this forum, and am glad I found it. My question may be simple, but I just want to make sure I have the right info. I have a NEF .50 Muzzleloader. I know that some can and some can't be fitted with centerfire barrels. What do I have to check on mine to be certain? Also, I am thinking that a .45-70 would be a neat "brush gun" to have in this gun. Anyone have any experience with one?