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Saw a YT vid some months ago of a guy loading up .40 brass in a Glock (with aftermarket fully supported chamber) to 10mm (or close) ballistics.
Kind of makes sense to me as the .40 brass is just as strong as 10mm brass, just shorter, so it will be higher pressures.
I would not want to do this...
Picked up my first Sig today for a steal, a 2340. It is used but appears to be carried alot but only shot a little. It is a Blueline with law enforcement on the box. The bonus is it came with 7 mags and both 40s&w and 357sig barrels. Hopefully I will get to shoot it Friday.