Yoter, would like to see a picture of your Knight Bighorn with the "exposed pivoting" hammer. You must have somehow heavily modified this rifle, since in stock form it looks like it has a traditional style of inline hammer. Also, the regs state "...patched round ball or conical non-jacketed projectile comprised "wholly" of lead or lead alloy. No mention of plastic being allowed. You will need to shoot one of the many 100% lead only full bore conicals. I have always had the best luck with Dynamit-Nobel caps. They seemed a little hotter than others on the market. I never had a misfire with these #11 caps. I personally think all these projectile, ignition type, and loose powder requirements are a bunch of hooey, but I don't get to make the rules. This is one of the main reasons I have put away my muzzleloaders, and am jumping into bowhunting. Rules getting more restrictive for muzzleloaders, and less restrictive (now 80% letoff allowed, and 300 grain arrows) for archery equipment. Go figure???