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Ballistically, the .45 GAP is roughly equivalent to .45 ACP in the latter's standard pressure loadings.
.45 ACP advantages: available in more platforms, and ammo much more readily available; also, hotter +P versions are available.
.45 GAP advantages, primarily, is shorter overall length allowing it to be chambered in pistols previously limited to 9X19 or equivalent length cartridges.
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Mas
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