A close analogy to a rubble pile is a shot and wax slug projectile commonly fired from a shotgun as opposed to a monolithic pure lead slug, with the former having a lower density as it is loosely held together by wax and is composed of numerous individual lead bird shot spheres.
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These would provide soldiers with additional capabilities, such as: door breaching using special slugs, very short-range increased lethality using 00 buckshot, and less-lethal capabilities using teargas shells, rubber slugs, rubber pellets, or other non-lethal rounds.