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Rarely if ever does a major ammunition manufacturer use a "canister" powder in its loads. Canister powder being powder that the average consumer can buy off the shelf. The companies most often use a proprietary blend of 2 or more powders.
Even if they did use a commonly available powder, anyone, without the proper analysis equipment, would be foolhardy to make an assumption as to its make up and burn rate. In other words, don't guess. Use readily available information in various reloading manuals instead.
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