The brass cases I use to use were Magtechs - the walls were very thin so the bigger wads could be used. I also have always used a Mec 600jr to load with when doing BP for brass or paper/plastic cases. The wad guide also helped loading bigger wads. I have some Ducks Unlimited Remington brass hulls, believe they're Magtechs - but they have a semi roll crimp to keep the OSC in place.