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AND the ctgs. also had large enough rims to lower breech thrust.

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It's actually the other way around.
For any given pressure, breech thrust increases as the cartridge base diameter and area increases.

It's x pounds per square inch cartridge pressure acting on x square inch's of base area to produce x pounds of breech thrust.

The bigger case head diameter will have the bigger base area and the bigger breech thrust.

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I've never been able to wrap my head around this...

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He who lives in the past is doomed to enjoy it.

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