I tried inserting 7.63x25, 9x19, and 9x25 cartridge into a 7.63mm pistol, also tried inserting these three type of cartridge into a 9x25mm pistol.
The only combination that definitely won't fire is 9x25 cartridge in 7.63mm pistol because the bolt cannot close. All others.. even with wrong cartridge, they will load and fire (firing wrong cartridge will damage the gun after a few rounds -- don't try it on collectible).
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