The design principle was to produce a very light bullet which could be launched at high velocity (hence the name THV = Très Haute Vitesse = very high speed). The bullets had a sharp point which in conjunction with the high velocity was intended to provide excellent barrier penetration. However, the sudden widening of the bullet behind the point was designed to generate a wide wound channel, and the light weight meant that it would quickly lose velocity, both in the target and (should it miss) in the open air. It was therefore only suitable for short-range use, and SFM only produced pistol rounds. As well as the three pistol loadings in my collection it was also made in .38 Special and .45 ACP.