1911Tuner
I've never found a live round on ground and can't find this malfuction in Jerry Kuhnhausens 45 auto book unless it's called early release,
Well...It happens, and Kuhnhausen has missed the boat on several issues. Take his "Balanced Thrust Vector" description, f'rinstance. "Early Release" works, though. Pretty much says the same thing. Many new magazine designs release the cartridge too early and too abruptly, and often lead to loss of control before the extractor picks it up.
the OP said mags worked in other guns without problems.
Sometimes the gun is a contributor. Overspringing the slide makes it more likely. Underspringing the slide for +P or even hardball-spec ammo will, too. A dead perpendicular breechface is an often overlooked contributor. The breechface is correctly set at 89 degrees/8 minutes...not 90 degrees.
Sometimes the distance between the breechface guide blocks is too narrow...which will do the same trick, but for different reasons. I like to see .484-.488 inch. Some smiths want .490 or even a little more. Below .480 inch, and it becomes a matter of "when" and not "if" it will cause a problem. I don't see this one narly as much as I did in the mid-70s until the early 80s....mostly with Series 70 Colts and cheap knock-offs, like Thompson Auto Ordnance pistols.
Most early releases cause stovepipes which I'm very familar with.
If you're referring to live round stovepipes...technically, that's known as "Bolt-Over Base" misfeed...which occurs when the slide rides over the rim and catches the case in the extractor groove instead of at the rear. Butt-end goes down...nose points up...and the cartridge does a pretty good impression of the "Brooklyn Salute" for all to see.
If the slide rides over the case and gets past the extractor groove...the term is "Rideover Failure to Feed." A more severe version, but not as dangerous as the first one. In the first...If the case gets hit hard in the web area, the primer can detonate...and you've got a minuature fragmentation device popping about 18 inches from the end of your nose. Saw it happen once. Bad JuJu. Warned the guy about it. He didn't listen. He got lucky. Shooting glasses saved his eyes.
In both malfunctions...either the slide is flat outrunning the magazine, or the gun is short-cycling.