The .54 eats a lot of lead, and is NOT necessary for hunting whitetail deer, or smaller game.
The Pedersoli gun has some problems, mostly because new shooters don't know it has a powder chamber, that is smaller than the bore diameter, and sometimes- not always-- these guns come with burrs and casting slag that partially blocks the flash channel from the nippple, or vent hole to the powder chamber. To get reliable ignition, powder has to be moved through the channel to the base of the nipple, or to the edge of the vent hole on flintlock versions.
I would recommend you look at a US made T/C rifle- either new or used, as your first gun. Take a look at our sale sight here and see what is available. You are more likely to get a good gun, and help in learning how to shoot it from members here, than buying a gun at Cabelas. And, you will pay less money. :thumbsup: