You have a limit on ammunition? Damn, I'm glad I live in the South.
A limit on the total number of rounds you are allowed to keep in your house
without a fire permit, the thing is if you do get a fire permit do not expect the fire dept to show up at your house during a fire.

Most serious shooters supply of .22 alone would put you over the limit.
I have been buying surplus 7.62X51 ammo sealed in battle packs for years, the only downside is the good stuff (eg. South African, German etc.) is usually Berdan primed.
Edited to include link to GOAL.
http://www.goal.org/masslawpages/ammostorage.html