I understand the Buckhunter is a very nice BP handgun. I have not had the opportunity to shoot one yet though.

I picked up for a song a really nice and NIBPedersoli 50 cal Kentucky Caplock pistol. Really very accurate 1:18" riflingand nice handling. My first BP pistol. I will be hunting deer in the 25 yards range or lessthis season witha non-traditional250gr Hornady SST and 25gr Black Mag'3.

Pedersoli also has a long barrel version called the "Bounty" which looks like it would be an excellent hunter. 45 or 50 cal, 1:18" rifling and 16 5/16" barrel.

http://www.davide-pedersoli.com

Otherwise T/C has an Encore pistol which is exceptional.
www.tcarms.com
Also check out:
http://www.midsouthshooterssupply.com/deptsearch2x.asp?dept=%4D%55%5A%5A%4C%45%4C%4F%41% 44%49%4E%47&dept2=%4D%55%5A%5A%4C%45%4C%4F%41% 44%49%4E%47%20%50%49%53%54%4F%4C

Traditions has the "Trapper & Kentucky"

Lyman also has the "Plains" sidelock pistols.

Also:
http://www.dixiegunworks.com/default.php?cPath=22_92_187_189&osCsid=899b2bb 61f0ca5710df8a7567cee6cf3

http://www.cherrys.com/ped_pist.htm