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Basically it's a matter of the difference between the design of black powder guns and those designed to use smokeless.
Black powder burns while smokeless detonates. Its the force of the explosion rather than the gases created by black powder that propell smokless loads. The thinner spots around the cylinder nipples can and usually will blow out using smokeless sending shrapnell into your face and arm. A conversion cylinder is safe because the rounds are encased in brass.
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