I've done it once. I was shooting my SIG P229 chambered in .40 S&W side by side with a rental SIG Legion P229R chambered in 9 mm Luger and comparing the two.
Sure enough, I accidentally loaded a magazine loaded with 9 mm in my pistol and fired one round. The case jammed in the action and the shot sounded funny. The projectile hit the target, but several inches low and wide.
The 9 mm case was bulged out somewhat but intact. A close examination of the barrel revealed no evidence of damage.
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