I have been doing this a few years now. I started out like the op and bought a lot of the ammo boxes to keep up with it all.
Now I put the load data on a card and stick it in the ziploc bag and all goes into a ammo can.
I do that and use the Food Saver. We get rolls so you can make bags any size.
Note} Some times I have to get more rolls, as she gives me that look! Why? She is running low on bags for food..............