Atually the fastest " domestic" car would be the Saleen S7.
0 to 60 in 3.5 seconds and a top speed over 200 mph.

Sorry I couldn' t resist.

http://saleen.com/home/home_set.htm?x=1

As far as the flattest shooting cartridge, loaded by one of the major manufacturers, would probably be the 30-378 Wea. mag. Of course these cost just as much as Lazzeronis' cartridges do.