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Kimio:
Powder burn rate is nothing more than how fast the powder releases its energy. Its only benefit to the reloader is to help choose a powder for a given caliber. Small cases like the .22 hornet require a fast powder; Medium cases like the .243 require a medium bruing rate; large magnum require a slow burning rate. With some calibers there's an over lap. However, you needn't worry about burning rate if you have a good reloading manual.
Semper Fi.
Gunnery Sergeant
Cliffprd L Hughes
USMC Retired
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