100-400 USD
It's a 54 caliber round ball
You will have to call TC to find out.
100-300 USD
2000
$1,800 I can't imagine $1,800 for a T/C muzzle loader! This is obviously not the inexpensive Renegade Model which as used brings around $125 and like new might go for $250. Is this 54 caliber percussion Hawken Model a custom shop or commemorative model? <><><> Agree- depending on condition, these sell for around $200.
2000
The Thompson Center hawken that I have,has a barrel that is 28 inches long.
On 90% of the guns it is stamped on the right side of the barrel as "Thompson/Center Rochester New Hampshire" and "HAWKEN 45 Cal" along with a serial number on the left side. If not the easiest way would be to go to gunbroker.com or Google and search for Thompson center hawken, compare the pictures and description to what you have.
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
There are a couple of methods, First and easiest is a 1 piece base made for the TC Hawken. and screws to the existing rear sight holes Available from many of the large retailers like Midway USA Cabella's and Thompson Center. With the base you can choose your rings or even use a scope you may already have, and be able to remove it for cleaning the gun. The second is having the barrel taped for rings, several style are made for this application also, and from the same retailers.
100-400 USD or so
You must call TC