I haven't tried running the #452423 through a self-loader yet. Charles Graff and others have said that it works well in cooperative bottom-feeders; sooner or later I'll give it a show.
My heresies extended some years ago to trying cast bullets in a stock Glock 21 with OEM barrel. At the time this was considered the height of folly. The Glock KB was still uppermost in hobbyist thinking, and the use of handloaded ammunition in Glock pistols was a cardinal sin.
I'm a bit like the late P.J. O'Rourke; I have no trouble discerning Right from Wrong, but can be confused by distinctions between Wrong and Fun. Cast bullets are Fun in one of its more pristine and unsullied forms, and I would be damned if I would let some Austrian obstinance stand in the way of my recreation.
One autumn afternoon I went to one of my desert shooting sites lacking flush toilets and ZIP Code with 4 different cast bullet designs sized @ .452" and .454", a total of 200 rounds. I mixed in 3 OEM magazines randomly during the tests. Not one stoppage resulted in 200 rounds, and that weird bore form didn't lead up with either diameter. The only anomaly I noticed was with the Lee 200 grain SWC/H&G #68 plagiarism; its feed cycle had a little hitch in its get-along, but all 50 of them fed fully--I made sure with a back-tap of the slide at first. An out-of-battery Glock slide is pretty obvious, too. Didn't happen.
Since that stunt work I have run a few casting through my 40 S&W and 10mm Glocks with the Lee TC 175 grain castings. The absence of mushroom clouds and tales of nuclear holocausts in the California deserts should speak eloquently of the unremarkable outcomes. Gen 3 Glock chambers support case heads sufficiently to allow for the use of resized cases IME in the calibers.
I haven't personally tested this heresy in stock 9mm barrels yet, my only available 9mm Glock belongs to a family member that still subscribes to the Gastonesque mantra--NO CASTINGS/NO RELOADS. Her flaunting of the One True Religion is typical; had that girl been born first, she likely would have also been the last of the line. A handful--since she began to walk. Reminds me of me, the miscreant.