I have the 10mm bug and have a ton of ACP brass a spare 1911 and it seems like a possibility.

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Of the Troops & For the Troops

I have seen it done .Gun was reliable and accurate. Don't know the final velocity he achieved but he was happy with it. J.Michael

IT IS AN EASY CONVERSION but it must be done right with the properly headspaced BBL. I have a 400 in Kimber, a Ruger P90 400,a S&W M645 and 745,....and dang it I can remember the last one[...phoooeeeyy??!!!!!]
The only brass I ever saw REALLY worth converting was the once fired WCC military cases.
Commercial RP brass sucked canalawater.
WW brass was pretty good too. SOME FC brass was okay but some of it must have been made form old beer cans or something.
STARLINE IS THE BEST...I recommend this highly !!!
Loading data is easy to find.
You will need a cannalure tool for use with UN-cannalured projectiles.
And so it goes...

box of .45 ACP Starline brass.

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Of the Troops & For the Troops

I was curious about this and looked up some ballistic info. (Basically I went to Buffalo Bore's website and looked at ballistics of various heavy auto cartridges.) Just from that comparison it seemed that 400 Corbon was a little behind 10mm in ballistics. I did learn that .45Super is a potent cartridge by comparison and 460 Rowland is downright stout.

https://www.starlinebrass.com/brass-cases/400-Cor-Bon-Brass/

Seems easier than forming to me.

...spending my money...

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Of the Troops & For the Troops