Nothing will happen not until you fire it anyway, no seriously that is how you make or forum an AI cartridge, is to chamber an non AI cartridge and when you fire it, it forms to the profile of the chamber, the term is called fireforming, you can still shoot with good accuracy while fireforming, you just lose about 10% velocity due to some of the pressure goes toward forming the case, instead of all going towards propelling the round, some purists load solely to fireform, by loading a cartridge with powder and instead of putting a bullet they cap off the cartridge with wax or what ever, that way you can forum without worrying about bullet trajectory, there is a valid argument that it is just as hard on the throats of the barrel, so you might as well enjoy the shooting, hope this helps.
Tanks Dean
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