You should get a TC Black Diamond inline that has 3 different nipples that can accept #11's, musket caps and 209's.
It has a conventional striker bolt design and the TC "No BS" lifetime warranty.
There's many used ones on Gunbroker but also some new ones.
Here's a beautiful new extended range version in stainless steel.
I think that Cayugad even has a Black Diamond in his gun cabinet and loves it!
T/C black diamond 26" .50 cal. sst/hardwoods #8949
http://www.gunbroker.com/Auction/Vie...Item=148882339