2. (center) 7.92mm Mauser - an early German bullet used during the wars of the first half of the 20th century, however, during WWII, it was one of the few cartridges used by both the Axis and Allies. This particular specimen seems to be a 'sabotage' exploding cartridge, as it appears to be loaded with a blasting cap and a small amount of explosive.
3. (right) 6.5x55mm wood bullet, usually used for drill rounds or for blanks in automatic weapons. The reason they are used in automatic weapons is that the wood bullet generates enough pressure to operate the action, but is normally shredded by a muzzle attachment.
2. (right) .224 BOZ, developed in the late 1990s with the purpose of defeating body armour. Original trials were successful, with this round firing a 50 gr projectile chronographed at over 2,500 ft/s (760 m/s). The main application of this bullet was intended to be made available for anti-terrorist and special forces use, not civilian use.
2. (center) Solid brass Hyrda Shok FMJ hollow point, an expanding bullet that has a pit or hollowed out shape in its tip often intended to cause the bullet to expand upon entering a target in order to decrease penetration and disrupt more tissue as it travels through the target. It is also used for controlled penetration, where over-penetration could cause collateral damage (such as on an aircraft).
3. 9mm tracer round (or possibly an explosive projectile), these type of bullets are built with a small pyrotechnic charge in their base. Ignited by the burning powder, the pyrotechnic composition burns very brightly, making the projectile visible to the naked eye. This enables the shooter to follow the projectile trajectory to make aiming corrections.
2. (right) .38 Speer Plastic Training bullets, designed in the 70s, this is a reusable molded plastic training component (red) with a firing primer (black) for short-range practice up to 25 feet. They are intended to operate with little recoil, giving the user better ability to practice aiming and technique.
2. (center) 5.56mm XM216 Flechette, a bullet designed specifically for the Special Purpose Individual Weapon (SPIW) needlegun, which fires a small fin-stabilized metal dart. The purpose of this gun and ammo was to eventually replace the military's M16 (an idea had around the 90s), since it was lighter weight and had less recoil (being that it just shot a litter arrow), however, this plan never manifested. Interestingly, the name of the bullet 'Fletchette' is actually French for 'little arrow.
3. (right) 7.62/.220 Salvo Squeezebore projectile, a triplex bullet which, when fired, are separated by compression into three separate projectiles in a circular dispersion, increasing hit probability. Projectiles were designed to be lethal to at least 400m and disperse in a pattern that would ensure at least one hit on a man-sized target at 400m.
2. (right) 9x19mm Israeli riot control shrapnel shell - an anti-personnel cartridge with steel balls embedded in amber resin, which would be ejected upon firing, allowing them to continue along the shell's trajectory and strike the target individually, operating very much in the same way a land-mine would.