At the moment the ammo is pretty small. I'm currently trying to think of a script that would drop a larger item in place of the ammo but not replace it.
I'll have to make it use a magazine based system like my AR-15 mod. As in you would have 2 ammo types the ammunition/base so you can still drop the smaller rounds and drop the larger boxes.
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https://en.uesp.net/morrow/editor/mw_cscommands.shtml#onpcdrop
maybe this somehow?