I am concerned that this rifle may not be a Pedersoli. CVA used to make a "Missouri Rifle," which was a simple, no-frills hunting rifle, sort of like CVA's version of a T/C Renegade, but with a rubber recoil pad. I believe these had a 1:48" twist, and had the word MISSOURI on the barrel. As for the "Hawken" designation, there are a lot of people out there who call any and every half-stocked side-lock muzzleloader a Hawken. Seriously. I recently saw a Pedersoli Tryon rifle advertised as a "Pedersoli Tryon Hawken."
Anyway, given the price tag, fiber optic sights, and 1:48" twist, I think there may be a possibility that the subject rifle is a CVA Missouri rifle. We will see when it arrives, I guess. I believe one of these sold through the classifieds here a few months ago*, and they have been discussed in the past. If it is a CVA Missouri rifle, $300 would not be excessive for one in good shape. If it really is a Pedersoli Missouri Hawken, the OP will have gotten an unbelievable deal, but miracles do happen.
We will hope for the best!
Notchy Bob
*Addendum/Edit: Big Sky Rambler sold a CVA Missouri rifle here last August. Search for "CVA Missouri rifle" and you should find his listing, with some excellent photos.