ATF was going to change current law to read 'any round .50 caliber and over', (instead of the law now in effect that reads 'any round over .50 caliber) is now classified as a "destructive device" and would be subject to the $200. tax per round.
In addition would come all of the same paperwork, and delays common to DD's today. I think even the ATF was worried that they wouldn't have jobs (or anything else) very long if they tried a change like this, but the concept of an "ammo tax" is the manner in which the gun grabbers are going to put most of us out of the sport.
These idiots don't realize they may get it back in the form of the one bullet rebate.