Unless I missed something at the retail level, ammo just goes up anyway.
However, This link may be the one increasing for the Federal Firearms and Ammunition Excise Tax Deposits.
http://www.ttb.gov/forms/f530027.pdfIf you scroll down the instructions get pretty specific.
A. Why must I file this form?
● You must file this form to deposit Federal Firearms and Ammunition Excise Tax (FAET) as required by Title 26, United States Code, Section
4181.
B. Who must deposit?
● If you are the manufacturer, producer, or importer of pistols, revolvers, other firearms, or shells and cartridges (articles), you are required to make
deposits once your tax liability exceeds $2,000 during a calendar quarter (January to March, April to June, July to September, and October to
December)
● You are not required to make a deposit if you have been instructed by TTB to file semi-monthly returns.
As ammo sales have gone up since BHO was elected, this amount may have gone up, which of course is passed down to the retail level. (US.)

I may be wrong but I'm sure if not March 1, than sometime soon after. States that are in a budget deficit, are bringing up ammo tax increases of up to 5 cents per round, to raise money.
Unfortunately, the 2nd Amend. doesn't state anything with regards to ammunition.
