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Apparently, the substitute(s), actually perform more consistently when only lightly compressed. The reasoning is the binding agent on the granules used to help control the burn rate are broken down under high compression. Since real BP does not have such an agent, unless you add it yourself, it is a much hotter load by weight.
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777 is the only one I'm aware of that needs light compression. I know you can squash the heck out of Pyrodex and it has no effect.