I used to troll DU back when this was first posted but somebody in their "Guns" forum resurrected this old thread. It has this classic post - although I must admit if the Brady's were smart they would attack our rights via this angle.
Note: this is not a real bill - just some DU whackjob's rather evil idea
"79. Bunker Buster Ban
I'm glad you admit that caliber does not equal power.
And its great to see that my suspicion, that gun huggers would go through all kinds of incredible gyrations to evade the intent of the law (i.e. developing the .49 Big Bullet or the .499 Bigger Bullet or the .499999 Biggest Bullet Ever), is confirmed.
Here is the fix for your tomfoolery, a ban based on the power of the cartridge rather than the size:
Bunker Buster Ban
Part I
This bill bans the manufacture, transfer or possession of any assembled cartridge (cartridge being defined as a bullet, casing, powder & primer combination), that when fired from an 18” barrel, produces total energy (as measured from the muzzle) in excess of 5000 ft-lbs. This measurement takes place at sea level with an ambient temperature of 85 degrees.
Part II
Any weapon capable of firing banned "Bunker Buster" ammunition (ammo falling under the definition above), is also banned.
Part III
Individual, separate ammunition components (including cases, bullets and primers, but excluding loose powder) manufactured for, or suited for assembly into, banned Bunker Buster Bullets, are banned."