#69009
Glenn
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Lower pressure rounds, like the .30-30 Winchester, usually yield maximum pressures at .0003″-.0004″ expansion. Modern cartridges, like the .223 Remington, will show maximum pressure at .0004″-.0005″, while .308 Winchester, .270 Winchester, etc., typically yield .0005″-.0006″ expansion at max pressure. Magnums, like the .300 Winchester Magnum, show maximums at .0006”-.0007” expansion, and should be measured on the belt.

http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads

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