Only 100? I keep the old reloading presses (3) hot trying to replace the ammo I shoot up at my makeshift backyard firing range. I like to keep 500 rounds on hand for each firearm that could be useful in an emergency situation, but any amount over that is always handy for practice.
If the price of copper and lead keeps going up like a rocket I may have to consider casting my own bullets from the buckets of spent bullets I collect from my range backstop from time to time, and buying used brass in bulk lots on internet auction sites. I keep the propellant charges on the light side to make the brass last through a few more reloading cycles before neck splits and such set in, but it will eventually wear out no matter what you do.