If a muzzleloader is converted to metallic cartridge, particularly a chambering that has ammo generally available today, does that get into a manufacturing gray area? Ive been able to do a fair bit of range time and varmint shooting, and have the bonus of more time with one of my kids. Silver lining. It has been disappointing that I dont have access to some projects and tools due to circumstances, and as things blow over regular life will kick back in and free time will will probably get scarce again.
as far as Federal law is concerned, the ONLY factor that matters is when the receiver was made. If you convert a muzzleloader using a post 1898 action it becomes a firearm, pre-1898 actions no matter the chambering are antiques and not classified as firearms Federally. Some States such as New Jersey differ.