Nothing like real Black powder in those rifles.
https://www.powdervalley.com/products/schuetzen-black-powder-ffg-1
I'd also get some magnum primers.
I like the RWS #11 plus
I have a 1994 chevy 2500. I bought it in 98 with 40k miles. I drove it as a daily until 2007 when I bought a Tacoma. After that it was driven by my three children through high school. They were spaced out exactly right so that as one finished up the next was just getting their license. I figured...
1 RCBS Partner press in nice shape $60
2 RCBS Partner press in fair shape, works fine, with primer attachment $45
3 Knight muzzleloader 209 primer conversion kit with 2 packs of extra sleeves, new $ $80
All plus shipping. probably a USPS Padded Flat rate.
Would consider trades for certain...