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A barrel without a feed ramp (like most 1911s) leaves an area of the cartridge exposed (unsupported) and prone to blowout with high pressures--something 45 ACP doesn't generate.
Ramped barrels have more support in this area, something you NEED when using high pressure 10mm loads.
Last edited by thedudeabides; December 6, 2012 at 08:05 AM.
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