Read on another forum about this and wanted to share. Probably just another repost but I did search a few times and nothing came up, so sorry if its a multiple. Mods delete if so. Hope this helps some people out.
From the OP:Tomovich:
My good friend Mike Venturino (gun magazine writer and father of BPCR) and I have a trick for dealing with the hassles and misery of shooting with BLACK POWDER (and cleaning up afterwards) and this corrosive combloc ammo is NOTHING compared to all black powder. This Russky (Yugo, whatever) stuff is smokeless powder with corrosive PRIMERS only. Here's the