How dangerous are antimatter bullets? (Patreon)

When matter and antimatter annihilate they release a crazy amount of energy.  The Hiroshima nuke was only the equivalent of about 1/3rd a gram of matter-antimatter annihilation.   A bullet containing only 10grams of antimattter would therefore produce a yield of some half megaton equivalent of TNT!  However you really couldnt even load such a bullet into a gun, or fire it, or for that matter simply drop it without it releasing that amount of energy!!  Hell I think that even the 2nd amendment proponents might think twice before suggesting that antimatter bullets be allowed.... not that it would really be an issue anyway, as simply to produce a single antimatter bullet would probably cost as much as mankind has ever produced ever!