 This was due to a combination of slightly higher velocity, a similar Ingalls ballistic coefficient to the M-193 bullet (0.245 vs 0.265), and the superior penetrating ability of solid cold-rolled copper bullets vs jacketed lead bullets given an equal sectional density.It was potentially lethal (80 Joules) up to 750m and its tendency to tumble on impact was twice that of the 5.56 M-193 bullet, thus ensuring more effective transfer of its diminutive energy to its target, especially as its tip tended to bend.Maximum range was 2,500m.