Ohi saw a cool mock up bullet at a recent gun show. It was a 20 mm cannon , necked down to a 50 bmg, necked down to a 30-06 necked down to a 223 necked down to a 218 bee, ( or was it flea?) anyways the the thing was lick 3 feet long and was called, "the ultimate varmint round" way too freaking cool. I want one!!!