The last elk I shot was w/ a .54 PRB using 120 grs. 2f. The ball nicked a rib going in and the flattened "ball" the size of a quarter was found under the skin of the opposite front shoulder. This lead cow went 40 yds after being hit at a paced off distance of 107 yds. The military is to blame for the modern jacketed bullets seeing these function better in military arms and the producers of "sporting" cartridges have been trying right along to equal the expansion of a PRB w/ all sorts of "gimmicks" eg...various versions of tip "wedge points", serrated jackets for "controlled expansion", various amounts of tip lead exposure, gilding metal jackets w/ varying thicknesses and all sorts of lead cores. IMO, the "sporting" cartridge manufacturers contrary to their "hype", still haven't achieved the performance of the PRB which has a much slower velocity.......Fred