(Dev ?) Rare/Ex Ammo Woes!!!

[Sekhmet]

just add

/equip ammo

to the very last line in your macro.

If you want to be double sure, add that into a separate macro and hit that before and after every fight/entry-exit of BC/etc.

This is exactly what I do, and it works quite well. The only problem I've come across is when your normal ammo runs out and the Animikii is the only thing you have left, lost it twice, but that was kinda my fault for not paying attention to my ammo reserves.

[Kensagaku]

That's actually the point of /equip ammo. Not /equip ammo "ammo name here" but /equip ammo. What that does, since you didn't specify an equipment piece, is remove your ammo slot completely. So if there's anything in it, now there's nothing. Removing/putting in ammo doesn't lose TP, so it saves you the headache of accidentally shooting your bullet simply because you don't have it equipped anymore, even if you ran out of other ammunition.