The first thing to do is have it appraised and authenticated. A good place to start is http:/www.gun-appraisals.com Without seeing the gun and being an original it would be hard to value it. Depending on date and condition I have seen them go from $1000 up to several thousand. Another option for a general value would be to search the on-line auctions, such as www.gunbroker.com and www.auctionarms.com or even www.proxibid.com enter your details in the search and see what is selling and for how much. You can also search the archives and or sold items to get an idea of what your gun is selling for. Another place to look is The blue book of modern black powder values, available from www.midwayusa.com and www.bluebookpublications.com as well as many of the other hunting and firearm stores. Also available to NRA members on - line for free at www.nragive.org That will give you an idea of the general value. Guns tend to have some regional value too, say a Thompson Center Seneca may be worth a bit more in the north east than in the mid west, and a Ruger old army may sell higher in the northwest than the east coast. Don't forget condition has allot to do with value, and with black powder the bore is king. You may have a gun worth for example $500, but the same gun with a bad or rusted bore may only be worth $150 so compare apples to apples.
Features and knowledge
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You will have to call TC to find out.
Any bullet that has a diameter of one half inch is a .50 caliber bullet. There are different .50 caliber bullets- my Hawken muzzle loading rifle shoots a .50 caliber lead bullet, but different from the .50 Browning Machine Gun (that is also used in the .50 Barret sniper rifle)
Most black powder bores have a twist that is relatively slow. Say 1:36 or 1:50. They were 1:48 twist in 45 and 50 caliber
$100.00 at best depending on condition!
New $330 from Bass Pro Shop used about $200 in good shape.
50-400 usd
50-126
The Thompson Center hawken that I have,has a barrel that is 28 inches long.
50-100 USD
50-500 usd