IRON NEST: Heavy Turret Simulator, a tower-defence-style artillery game, features 21 distinct ammunition types, each with different damage, blast radius, charge counts and requisition costs. New players can rely on basic HE shells for early missions, but success in later, more complex levels depends on choosing the right shell for the situation rather than defaulting to high damage output.

Key stats such as Impact Radius and Requisition Cost are crucial to mission performance, particularly for players chasing Gold Medal ratings. Shells vary widely in purpose: some, like TEAR and WP, deal no damage and serve tactical functions instead, while others such as ATMC and EQKE offer higher damage at greater cost. Players are advised to use multi-charge shells for distant targets, watch blast radius to avoid friendly fire, and keep requisition spending in check to maximise mission scores.