I have known this cartridge since its inception, started loading and shooting it since Mar 1990 from a S&W 1006! Mild to Wild it is ballistically perfect!

Know Your Cartridge: 10mm Auto
http://www.gundigest.com/ammunition-reviews-articles/know-cartridge-10mm-auto

"Actual ballistics are generally about 100 fps slower than early factory claims, so actual 10mm Automatic factory loads do not significantly exceed .45 Automatic +P ballistics."

They needed to shoot some DoubleTap or Underwood.

Or some of my reloads with Bule Dot and 800X over a 180 gr bullet, there honking!!!