I usually use tracing paper, if the boolit doesn't need to be increased in diameter much. Two of my favorite paper patch boolits for my .45/70's are the 340 gr. and 405gr. Lee bullets. They cast a bit small as it is, and with 2 wraps of tracing paper and a trip through a .460 sizer, they both work great. But patching up a .45 pistol boolit takes a thicker paper. I noticed a roll of freezer wrap paper in the house the other day. It is slicker on one side than the other, but is incredibly tough. One problem I can foresee is getting the second wrap to bond to the first, with one side being smooth and kind of water resistant. But, maybe the old trick of putting a bit of egg white in water, or a few drops of water soluble white glue in water might fix that. The printer papers and others are certainly good enough, but as I say, this stuff is really tough. Has anyone experimented with this stuff?