Until recently these were usually confined to .22" caliber and used in shooting galleries. They are designed to disintegrate on hitting the target and consequently will not ricochet. They consist of particles of iron or lead bonded in some synthetic material. One manufacturer describes a .22" short bullet as being lead or iron bonded with lanolin.96 Such bullets are also used for training purposes.
Frangible bullets have recently become popular in a range of calibers due to the trend toward lead-free ammunition for indoor training purposes, the conventional lead bullet being replaced by a frangible nontoxic alternative coupled with the use of lead-free primers. The PMC ammunition range includes frangible bullets (93% copper and 7% polymer) coupled with a primer composition that on discharge leaves only a small trace of potash (K2O) in the firearm, which is harmless.
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