He was never mistaken, in his little world. He can hacksaw barrels, rattle can spray stocks, shoot heavy bullets slowly, or even shoot good bullets through a slower twist barrel, and it all is perfect with roses and daisies. If anyone else does it though, they have their head up their butt and don't know Schmidt from shinola.
I did find a video of him talking on YouTube. This must have been back when he was thinking and speaking slightly more clearly:
