Jon,
If you call CS, and they fitted the barrel, they could tell you what year it is. If the barrel was just purchased and installed by the previous owner it might not be so easy.
I could help you date it, if you give me some information.
2002-2003 = Plastic sights, 7/8" breech plug, and brass ramrod. Only 24" blued and SS rifles available.
Sights like on this 2002 model.
http://www.graybeardoutdoors.com/smf/index.php/topic,112825.0.html2004 = Williams Fire-Sights (aluminum alloy), 7/8" breech plug, and brass ramrod. Introduced 26" barrels and Sidekick.
2005 = Williams Fire-Sights, 5/8" breech plug, and blackened brass ramrod. 24" and 26" blued or SS available.
2006 = Williams Fire-Sights, 5/8" breech plug, and blackened brass ramrod. Discontinued 24" barreled rifles (except in barrel program and blued Huntsman Combo's).
2007 = No more Huntsman rifles or Huntsman Combo's (except barrel program). Only 26" blued or SS Sidekicks.
I have upgraded my 24" 2003 SS Huntsman with the Williams Fire-Sights, Williams Peep Sight (for Colorado), blackened brass ramrod, .25 ACP breech plug, Scope and synthetic Monte-Carlo stock for Michigan. I have shot 200 to 300 grain saboted bullets with 85-100 grains of 777 FFG or Black Mag '3, and 430 to 460 grain all lead conicals with 80 grains 777 FFFG.
With 777 powder, you don't need any more than 100 grains. I only use 80 grains of 777 FFFG powder (equal to about 100 grains of black powder or pyrodex), and a 430 grain conical for elk. Kills 'em dead!
Works pretty good on whitetails out to 170 yards too.