Frederick Chase, o pai de Annabeth criara balas com invólucros de bronze celestial.
Her father blushed. "Well, not bad for a middle-aged mortal, I suppose." "But the celestial bronze bullets! How did you get those?"
"Ah, well. You did leave quite a few half-blood weapons in your room in Virginia, the last time you... left."
Annabeth looked down, embarrassed. I noticed Dr. Chase was very careful not to say ran away. "I decided to try melting some down to make bullet casings," he continued. "Just a little experiment."
Percy Jackson and the Olympians 03 - Titans Curse, Chapter 18, A Friend Says Good-Bye
Bronze Celestial não é um elemento raro de acordo com wiki
Celestial Bronze is normally mined from Olympus, if Hephaestus is upset with his work, he throws pieces of Celestial Bronze into the mortal world.
Celestial Bronze seems almost as abundant as iron to Greek Demigods, as not only their weapons made out of it, but it seems like almost everything the Greek Demigods make is made out of it, using it as a magical alternative to what other metals would normally be used for weapons. Though this is justified as its mined from Olympus which is right above the Empire State Building.
Eu posso pensar em algumas razões pelas quais as armas modernas não são usadas regularmente
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A missão dos nossos heróis é de maior duração. Armas modernas, como armas, ficariam sem balas e heróis não poderiam voltar ao Acampamento Meio-Sangue para conseguir mais munição.
Nem todos os heróis são como Leo Valdez, que pode criar novas armas. / máquinas sempre que necessário.
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As armas tradicionais não precisam ser recarregadas e adicionam mais drama, porque os heróis teriam que se aproximar o suficiente dos monstros para matá-los.