Rey, I use leather for the over powder wad so it squeezes thru the smaller hole in the mouth. I push it thru with a pencil or similar object and tamp it down on the powder. I then use either card stock or thicker leather for the over shot wad, I made a small steel insert that fits into my die mouth and has a 5/8? in diameter hole in it with a domed top that curves the case mouth and crimps the overshot wad in place, then a drop of Elmer?s adds a bit of piece of mind to the crimp/wad.
To swage the end of the cases it depends on what cartridge Im Starting with, my 500?s are staged using my bullet seat die for 45 colt, there is a large chamfer on the bottom of the die and it works really well. For my 45 colt shot, a 40sw seat die does the same job, just lubricate the case and push it a half inch or so.