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A 20mm is considered a cannon shell. While some are solid projectiles, many have an explosive or incendiary core. These also contain a powerful primer to ignite the large charge of powder. Attempting to disassemble large caliber ammunition is very hazardous, and should not be attempted. Ordnance disposal staff use special tools and safety equipment when it is necessary to do this. These shells are capable of causing death or serious permanent injury. DO NOT ATTEMPT THIS.

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