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Brendon Greig

Wondering how much pressure difference there is between full length sizing and neck sizing with the same powder load. does the fact that the full length sized shell has to expand to the chamber as it pushes the projectile into the neck reduce the pressure compared to a neck sized shell that is just pushing the projectile into the lands was wondering if it has a similar effect as a long throat where the projectile gets moving before full pressure this maybe coverd in the books but I'm sitting waiting for a customer thinking about stuff I'd rather be doing instead of work