As with other most other cartridges, the Weatherby's performance with mono-metal bullets is slightly poorer than with conventional bullets. Mono-metal bullets tend to be longer for a given bullet weight than conventional lead core bullets. For this reason, the mono-metal bullets similar to the Barnes TSX may have to be seated more deeply into the case displacing volume which could be filled with the propellant. A loss of velocity of can be expected with these mono-metal bullets. Likewise bullets which have a higher specific gravity than lead, such as the tungsten core Speer African Grand Slam solids being shorter than conventional FMJ bullets will allow for more powder capacity and therefore a higher velocity.