handgunhuntr,
while you have a valid point about the range of your hand cannon vs the range of the inline ML & sluggun, IF the purpose of the regulation is to keep centerfires out of populated areas, then you can see how allowing centerfire handguns would open the door for people to say "well then why not my lever action 44Mag then, too?" I guess they had to draw the line somewhere, and I think they drew it at centerfire / cartridge guns.