Ammunition shortages: Obama's Clayton Gun Ban?

It wasn't just a run of bad luck: the ammunition shortage is real and is now having a definite impact on prices. Try 50-120% price increases for both pistol and rifle ammunition. The reasons are many and varied, but my favourite is the conspiracy theory that Obama is about to impose a huge ammunition tax surcharge that will see the prices skyrocket by (take your pick) 100%, 200%, up to 500% and even beyond. Why ban guns (with the likely Constitutional impossibility it rises) when you can tax ammunition out of the reach of most?
The shortage has also reached Europe and Australia, as Americans throw away recession woes and stock up. And many of those people seem to have a justification to do more with internal revolution and/or invasion than anticipated price hikes. Oh well, I guess Red Dawn still lingers in some people's minds more than mine...