.357 Magnum

.357 Magnum is a small, but high powered caliber that's an umbrella for a set of subtype rounds. Unlike most calibers, .357 Magnum has no upgrades beyond its stock form, due to it having numerous subtypes instead. The rounds are made using .357 casings, primers, any smokeless powder, and a specific material for its projectile, making 24 assemblies to be pressed with a .357 Magnum stamp. Most subtypes have the same basic stats as the first round, unless otherwise specified.

Iron
Probably the first rounds you'll make due to the simplicity of the materials required. It can only be fired from the Simple Revolver, limiting its usability. It is simply known as "Bullet" in-game.

Lead
Lead bullets are more capable and useful, so it may be wise to skip Iron to Lead. It does over twice as much damage and the upgraded revolver it's primarily fired from is not much more expensive and it has higher durability.

Gold
Gold bullets are more of a novelty than an actual practical round. While they do higher damage, they are much more expensive and are not notably better in any other aspect.

Nuclear
While not doing quite as much damage as the other rounds outright, it applies the Contaminated effect onto the target, which causes significant irradiation. The assemblies only take Cordite as the propellant but can have a multitude of projectile types to have the same effect, the cheapest being Trinitite, which only needs nuggets, while Uranium-235 may be the most expensive since it takes the full ingot.

Desh
Deals a good amount more damage with no tradeoff of higher wear and can be used in any .357 Magnum revolver. Only takes Cordite for its propellant. How expensive it is depends on how good your Desh production is, which often varies between players.