Very Good read and answers alot of questions about Sen. McCains' views on Guns.
This also points out a very important fact that is often missed when discussing presidential candidates, that is that the Supreme Court will be the ones who will take away our gun rights and not any President. The 2nd amendment will never be abolished however the Court has already ruled that it does not guarantee that your gun rights cannot be regulated and that's where they'll get us.
What does "gauge" mean anyway? As used here gauge means the number of round lead balls the same diameter as the inside of the barrel (aka the bore) that it would take to weigh one pound. It takes 12 lead balls the same diameter as a 12 gauge barrel to weigh a pound. The smaller 20 gauge would require 20 balls of that barrel diameter. The larger bore 12 gauge would require 12 lead balls of the bore diameter to weigh one pound.
In general the number of pellets in a shotgun shell...