I'm actually keeping magical bullets relatively separated. Its part of the philosophy that Heroic follows that says "Magic items are very special and not to be used lightly."

A magic item takes a few weeks work in game; you have to collect the material and forge it, imparting bits of your characters energy in to it, usually in the form of blood or some other bodily fluid. A great deal of effort goes in to making magical weapons, because when you get one its going to last you a good long while - that an its very rare that you'll find a magical weapon, even inside of a treasure vault.

Its because, unlike Magic, magic items use Arcana as their power source. The main difference is that Arcana is permanent; a magical item cannot be easily disenchanted without using the complex Shape Reality spell, and if that's done poorly it's likely going to detonate on you for some hideous effects.

What this means is that wizards are not actually going around enchanting items, not really. That's the job of Master Crafters, or adventurers who happen to either come across or find someone with an Arcana Codex, which gives players the steps to follow in order to turn a non-magical item magical.

So bullets would still take a few days to do, and once they're fired they're destroyed. Really the only useful enchantment for a bullet to have would be "Indestructible," but unless you are a very wealthy adventurer that's going to be beyond your means.

But yes, back to writing. I'm getting way to distracted from describing how you create a hybrid race.