I am downsizing and have two barrels for my Thompson Center Renegade .50 caliber percussion rifle. One barrel came with the rifle, a 26" with 1:48 twist. The other is a 30" barrel made by Thompson Center with 1:66 twist that I bought for shooting round lead balls. What would/should the 1:66 twist barrel bring if I sell it? I have the factory box for the 1:66 barrel. I can't find the 1:66 barrel for sale anywhere, Ebay, etc., to get an idea of what it's worth. I just shoot paper targets. As good as the Investarms Hawken I just picked up shoots, I may unload the Thompson Renegade once I sell off the 1:66 barrel.