SIM-X technology yields rifle velocities in handgun/pistol calibers, without +P pressures or increased felt recoil. We are expanding the boundaries of pistol caliber velocities by increasing efficiency of the captured powder charge. With this increased efficiency we can generate rifle velocities in our pistol calibers that are twice that of traditional pistol rounds. SIM-X ammunition used in SBRs (short barreled rifles) achieves velocities typically only found in center fire rifle calibers. Higher velocity equals flatter trajectories with higher impact energy.