that fire coarsely ground gunpowder. Bullets used in WFDA and other similar competitions must be commercially manufactured, and there are a number of manufacturers who produce wax bullets for this purpose. During the early 20th century, there was some interest in mock pistol dueling using wax bullets. The sport first gained popularity in France where in 1901 Dr Paul Devillers, who was also a keen ‘duellist’, designed a new innovative wax bullet for duelling practice. Heavy canvas clothing was worn to protect the body, a metal helmet with a thick glass plate protected the head and face and the pistols were often equipped with guards on the front of the trigger guard that extended outwards to protect the shooter's hand. For a brief time it was popular. It was featured as an associate (non-medal) event during the 1908 Summer Olympics in London. Target practice There are a number of other low velocity, low mass projectiles available to shooters. Rubber or plastic bullets designed for short range target shooting with primed cases can also be purchased; these are generally reusable if a proper bullet trap is used, but are prone to ricochet. With wax bullets, a simple sheet of plywood is sufficient to stop the bullet—upon impact the wax deforms and sticks to the wood, where it can later be scraped off and reused. The cost per round of wax bullets is low as primers can be purchased for under US$ 2.00 per 100 in case lots and as the wax itself can be reused. Reloading is very quick, and requires minimal equipment: a decapper tool to knock out the used primer and a priming tool. With these, loading 50 rounds of wax bullets will take under ten minutes. Wax bullets are normally used only in revolvers and single shot pistols for short range target practice. Magazine fed firearms can use wax bullets, but they may need to be fed individually. Combat training The US military uses 5.56 mm non-lethal marking rounds in training. The bullet has two primers. The forward primer propels a wax-filled projectile that marks with colored wax upon contact. The wax washes out with normal laundry procedures. Simunitions (for "simulated munitions") are special cartridges that fire colored paint-filled plastic projectiles which are used to mark targets much like paintballs. Simunitions are designed to cycle the actions in specially modified semi-automatic rifles and pistols. The paint-filled plastic projectiles