The deformity on the base was probably made when the missile was cast...
?? The bullet base has to make a tight seal with the shell (to seal in the gunpowder contained in the shell). There is no way that bullet deformity was there before firing.
The Single Bullet Theory is just that..a theory ...it is the silliest most ridiculous theory I ever heard.
What about the Trump theory that there was no collusion with Russia. Or that Canada is a threat to US national security because the British burned the White House in the War of 1812 (which the US under James Madison started in order to take over the remaining British colonies to the north).