Is there a website out there that compares all - or mostly all - makes and models of each of the BP rifles?

Thanks

I am not aware of one.

But there is a book that did this for the major in-line brands. Books-A-Million carried in their sports section. I think it was called Modern Muzzleloading. You may check their website or Amazon's. The book was recently published, it included the Knight Disc rifles which are fairly new. If you use the key words muzzleloader or Black Powder it should come up.

Good luck.