How Rust calculates bullet spread angle:

In BaseProjectile:

• aimCone (float): Base weapon spread angle in degrees.
• aimConePenalty (float): Accumulated spread while firing.
• stancePenalty (float): Standing multiplier (typically 1.5x).

The game calculates final firing direction by taking camera forward vector and applying a randomized polar angle offset within aimCone radius.

Reading aimCone values in real-time allows drawing an accurate dynamic spread circle on your HUD!

Dynamic spread circle in ImGui expands when you move and contracts when you crouch. Gives perfect visual feedback on shot accuracy.

Great explanation of Unity weapon spread math.