I think you could probably cut your ammo stockpile in half, and would still have too much. Well, unless you're prone to shooting in full-auto... then stockpile away. I made it thru 99+ levels with for the most part, a single stack of each caliber. The progression thru levels, ammo scavenging and 1-2 ammo outposts was enough to maintain my supply. Now, you probably have preferences in caliber like I did, so you can make adjustments. In the last 20 levels, I more or less only used 7.62 (every community member had an AK variant, or one of its contemporaries). Even so, I only had 2 stacks of 7.62 in my locker— the rest went to enclaves.