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My understanding is the shorter its seated reduces case capacity, while seating longer creates more empty space so pressure drops.
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if u publish a maximum powder load, if you go shorter your pressure goes up and will exceed max.
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In straight walled pistol rounds, yes, in bottle necked rifle rounds, not so much. The shorter the OAL the farther the jump, the farther the jump the Less the pressure.
The longer the OAL the less the jump, the less the jump the higher the pressure.