A "heeled bullet" refers to a type of bullet design where the rear part of the bullet, or the heel, is smaller in diameter than the part that is forward, or the body of the bullet. This design allows the bullet to fit snugly into a cartridge case while also allowing the larger diameter portion to engage the rifling of the barrel when fired. Heeled bullets were commonly used in some early cartridge designs, particularly in revolvers and black powder firearms.
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