My Accura MR shoots Federal BOR Lock MZ's really well, and they load like butter. Almost don't need a bullet starter, I would recommend them over powerbelts.
Check with CVA but I think the only loose powder that takes a special breach plug is Blackhorn, all others (meant for muzzys) should be fine.
I use the CVA cleaning kit, but there are cheaper options (hot water, windex, etc.)