You probably won't notice much difference in accuracy between the different barrel lengths. But one difference betweenmodels is their weight and balance, and the longer barrel does make for a longer and more accurate sighting planwhentakingthose long distance shots.
The traditional PA Rifle barrelisextra long at about 40 inches, and they are known to be extremely accuratebut a lotmore expensive withit's fancy brass patchbox, brass inlays and double triggers.
The next longest gun that ismore economically priced is the .50Traditions Kentucky flintlockwith a33.5 inch barrel. It only has a single trigger, andTraditions locks maynot bethe fastest orbest, butthe Kentucky rifleis one of the mostbalanced models for its lengthand their1 in 66" twist barrel is known to bevery accurate. It still hasa full length stocklike the PA Rifle yet itonly weighs 7 pounds due to its more slender barrel.
Midsouth sells it in flintfor $303.

http://www.midsouthshooterssupply.com/item.asp?sku=00139R2010




http://www.traditionsfirearms.com/eshop/10Expand.asp?ProductCode=R2020