The actual burning rate and position on this chart can be drastically altered by many factors including case size, bullet weight, expansion ratio, operating pressures, lot to lot variation, manufacture date, etc.As a reloader, I've used the relative burn rate charts along with the usual cast of reloading manuals to guide my powder selection and starting charge weights. Powders are burnt in realtime speed as well as Burn rate charts can never reflect the differences between powders in the correct proportion, and can only place powders in approximate burn rate envelopes. Powders within three lines of one another are similar in relative quickness but cannot be directly substituted without due regard for safe reloading procedures.
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