Yes, it's possible even with different "lots" of the same ammo. Do you really expect the police to tell you everything they know? Do you expect them to tell you things that might jeopardize the case? I am perfectly willing to wait. Others are very impatient. Tell me, what difference will it make to you if this is wrapped up tomorrow or 6 months for now? Don't you find this case interesting? Why are some so anxious for this to end?
So, if that is true there would be no way of VERIFYING a match or not, to the residue found on his hand(s). I don't know if Covelli offered that tidbit just for something to say, or if he was answering a reporter's question. Either way, it is non-information. The abiding inference is, then, that CG was shot by his own gun, and he has gun residue on his hand(s). Ergo, the residue is probably from him having shot himself with his own gun. JMO