I have used tissue paper for 45-70 loads, with no issues. We all take chances when using fillers in our NFB loads. Kynoch uses the foam wads in their cartridges, full nitro and NFB, which made the choice easier for me. I would like to think, that, if the Kynoch cartridges were ringing their own test barrels, and/or customers' barrels, they would not use, or sell them.