I load slugs and punkin balls (.690 ball) with a 600jr. Use the press to deprime, throw charge, seat wad just like any shotshell load. Add projectile, then star crimp LEE slugs or punkin balls with press, or roll crimp regular Foster-type slugs with a crimper in a drill press.
Load data from Hodgdon, Alliant, Accurate. (And probably a lot of other sources. Those are just the ones I use).
DC