No, the reg I was referring to goes back at least until the mid 90's. It may have been written in an OPNAV Instruction but it had to be authorised by Congress. When I went to small arms management, the instruction read something to the effect that you shall maintain a reserve of at least equal to your annual allocation.
DHS let a contract for 150 million rounds and uses 115 million annually over the course of the contract. The factory where you worked didn't add a little fudge factor into bids? I doubt it. They don't have to receive all of it but they do have to be able to get at least what they are using.
Like I said, its all for show. They just want to look like they are doing something before an election, nothing will come of it when or if its implemented.
Like CR mentioned here and Magoo on the other thread, ammo availability and price are more a function of individuals buying it all up, not just the gov. The gov doesn't use 357 or 22 may at all and VERY little if any 22lr but you can't find it anywhere. We did use as much 12ga as we did 223 for awhile where I was at but you can still get it at WalMart.