As long as there is gas behind the wad, it is not going to slow down because of a couple of thousandths of taper ahead of it. We can talk this to death, but I can still throw 90% patterns out of an untapered barrel with cardboard and felt wads and lead shot. I never thought I needed more than 90% for anything. I am even starting to shoot spreaders in my pigeon gun because I can't hit box birds worth a darn with eight inch patterns any more, if I ever could.