Pennsylvania has two seasons. The early season in October is a 1 week long, antlerless only hunt that allow pretty much any type of muzzle loading set up: inline, caplock, flintlock. Scopes are allowed as well. It requires an antlerless tag to participate. 
The original season started way back in the mid 1970s and occurs after Christmas. This three week late season is a flintlock only hunt with traditional sighting. No scopes allowed though I see peeps are now permitted. Buck or doe can be tagged with an unused regular antlered tag or doe with a antlerless tag. 
Any regular rifle season allows the use of any type of muzzle loader of the specified minimum caliber: .44 or larger rifles or .50 and up pistol. 
I started hunting with a flintlock in the regular firearms seasons in the early 1970s. Pennsylvania has its share of wet sloppy weather which makes it a challenge to use a flintlock, let alone a traditional percussion gun. Let's face it gents, back in the 1700 and early 1800s they didn't hunt in the rain, but holed up instead to wait it out for better weather. Nowadays we hunt on a schedule and have no choice. But at least we have better clothing ... and meds!
My coonskin cap is off to Ken for his achievement, regardless of the century.

John   

Marlinguy, thanks for the reply.

Congratulations on a nice bull elk.