A 10mm Bullet is the ammunition used by an SMG. It can be found scattered throughout 7 Days to Die or it can be crafted using Bullet Casings, Bullet Tips and Gunpowder. A 10mm Bullet can be scrapped or melted in a Forge to produce brass. 10mm Bullets have a maximum stack of 500 rounds.
Before the player can dismantle a 10mm Bullet they must have unlocked the recipe using the correct Recipe Book. It can be dismantled by placing it into the output slot of the crafting grid, this will break the weapon down into its component state and display the parts in the main crafting grid. The player can simply remove the part they require and place it into their bag or tool belt. As of alpha 12.2, every part of the 10mm Bullet is obtained upon dismantling it. 
Before you can craft a 10mm Bullet you must have read Ammunition Nation Book and you will need the following items.
To craft 10mm Bullets place the ammo parts into the crafting grid as shown below.
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