Pyrodex RS will work just fine. Pyrodex P is better but harder to find in stores. Just be aware, of all the powders out there, Pyrodex is one of the most corrosive of them, so be sure and do a good cleaning after using/shooting it.

As for how to load the PA Conicals, like any conical, drop the powder down the barrel and then seat the conical on top of it. I believe the PA conicals come pre lubed. I am not sure if they are a hollow bottom or flat but I believe they are somewhat hollow as I remember.

When you get your powder charge down the barrel and your roundball/conical on top of the powder charge, make a witness mark on your ramrod. Leave the ramrod sitting on the charge. Then take a piece of masking tape and wrap that level around the ramrod to the muzzle. Next time you load, make sure that the ramrod reaches that mark. This will tell you the ball is seated right, or even if you forgot powder. It will also tell you if the rifle is loaded, and when it is time to clean the fowling. If you can not get that projectile seated to that witness mark without a lot of effort, swab the barrel.

Some old timer tricks which some do but not all, after dropping the powder down the barrel, take the rifle and thump the toe of your shoe with the butt end of the stock, while keeping the rifle pointed straight up. This will cause the powder to fill the cone of the breech better and it levels the powder charge also. Then set the roundball or conical on top of that.

Before you shoot on the range, be sure to pop three #11 caps through the nipple of the rifle while empty. This will blow clear the fire channel and also coat the inside of the fire channel with a small amount of fowling from the caps. Then push a clean dry patch down to the bottom of the breech and then pop one more cap. Pull this patch. This patch will show you how much fire is making through the nipple and fire channel in to the breech.

Also when I shoot Pyrodex the only thing I will swab my barrel with when it needs it is pure 70% isopropyl alcohol. When you buy isopropyl it comes in two strengths in my Wal Mart.. 70% & 91% I use the strong one for mixing with windshield washer fluid and the weaker as a straight swab... especially when shooting Pyrodex. You get too wet a patch done there of other stuff and you get fowling mud and the rifle will misfire.