Why a bullet might bounce back at the person who fired it
In short: A ricochet is more than a simple bounce; it is a complex physical interaction where a projectile's shape, spin, and velocity collide with a target's density. While most are accidents, these deflections can retain enough energy to remain lethal, creating unpredictable hazards in seconds.
The physics of a ricochet are governed by the interaction between a projectile's sectional density—its mass relative to its frontal area—and the target's material properties. Dense objects generally prevail in these collisions; dense bullets tend to penetrate less dense materials, while dense materials deflect lighter projectiles. For example, metallic foil is easily penetrated compared to metal ingots. Even non-solid surfaces like water can cause bullets to ricochet, a phenomenon similar to skipping a stone.
Velocity and shape play critical roles in how a bullet behaves after impact. High-velocity rifle cartridges are more likely to penetrate because their energy can fracture or melt a target. Conversely, handgun cartridges and low-velocity rounds, like the .22 long rifle, have a higher probability of ricocheting. While a ricochet can reduce a bullet's velocity by as much as 35%, it may remain energetic enough to cause significant collateral damage. Furthermore, spin-stabilized bullets may be deflected in the direction of their rotation when they contact a resistant surface.
Predicting the angle of departure is notoriously difficult because of the deformation the bullet undergoes during impact. While grazing ricochets typically depart at a smaller angle than the angle of incidence, a bullet striking a nearly perpendicular elastic surface can occasionally reflect directly back at the shooter. This has been observed with hardened armor-piercing cores failing to penetrate steel plate. Historically, the use of cannonballs also relied on intentional ricochets to keep projectiles at effective distances above the ground or water during sieges.
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Sources
- Summary by Intellect · source: Ricochet
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