Yep, you're going to have a bunch of headaches with using musket caps on a #11 nipple. You'll need to go back and get a musket nipple (make sure it has the correct threads. T/C's use different nipple threads than foreign rifles, and while the foreign ones will seem to screw in, they will not be tight enough and the nipple will eventually get blown out toward your face. Don't ask how I learned this). However, once you have the musket nipple, I think you'll be very happy with the musket caps. They put out a lot more flame than #11's, and they are much easier to handle and stay put better.

Mike