Quick models I did in an hour, enjoy.
Bullet types include: 9MM 22LR 12G and 762. Materials can be used via the blender file or the uploaded Albedo texture, the single texture works across all of the bullets.
https://drive.google.com/file/d/1Kei4ReEgSOlAgjB7Ooo1rat19KoAcznr/view?usp=sharing