I was just there buying a sling last week or so. They're CLOSED from the 13th to the 18th for Inventory. They do this after every PA Flintlock Season (annually), so I'd call before I'd drive a long ways. They are OPEN Sundays, so maybe the 19th will be better?
I'm one of their "regulars" and I drive 100 miles each way to get there! Been going there for YEARS! Great folks, and will help you with all sorts of building questions. They have 3 powder magazines and always have powder (except during the Fair--they run out every year--because they can't pay for a 4th magazine to get used only once a year).
Gregg's Dad Chuck wrote a book on building the PA Long Rifle, and the entire family is into competitive shooting.
If you wind-up getting there, be sure to stop at Dietrich's Meats (just off the Exit #40 on Rt. 78), and the Winery around the corner from them. Cabela's has other "stuff" to do than just Cabela's these days, including a huge Cigars International store next to their parking lot.
For cheap eats I go to the Kempton Inn in Kempton, just down Rt. 737 from Dixon's! Priced right and decent portions. Near Cabela's there's a McDonalds, Burger King, Red Robin, etc.
So a trip to Dixon's can be an interesting, all-day affair with Alcohol, Tobacco, Firearms & Explosives, lol! (Ought to be a convenience store instead of a Federal Agency, lol!!!)
Enjoy yourselves!
Dave