A firearm projectile includes a central section, a forward or leading section, and a rear or trailing section. A step down is provided between the central section and the trailing section such that the cross sectional area of the trailing section is less than the cross sectional area of the central section. In addition the trailing section is provided with a cavity that is open about the back of the trailing section. The cavity includes a forward section and rearward section. Forming the part of the forward section is a forward wall that terminates in the trailing section short of the central section. The rearward section of the cavity flares outwardly with respect to the forward section. Furthermore the rearward portion of the rearward section of the cavity forms a part of an annular flare ring that extends around the outer portion of the back of the trailing section.