pub const BULLET_LENGTH_RHO_EFF_KG_M3: f64 = 7600.0;Expand description
Effective density (kg/m^3) used by the mass-based bullet-length estimate.
A jacketed lead-core bullet is not a solid cylinder of lead (11340 kg/m^3): the ogive/boat-tail
taper and the copper jacket lower the effective density that relates total mass to a simple
length * frontal-area cylinder. 7600 kg/m^3 was fit so common lead-core match bullets land at
their real length / caliber ratio (see reference-bullet unit tests below). MBA-1135.