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Slower powder has higher port pressure. That's about it. It can cause issues, or even break things, if the system is not adjusted. With proper adjustments it will work. It is true that MV will be lower than bolt action. Energy is indeed syphoned off to work the action.
On the other side of the coin, fast powder will have lower MV and lower port pressure, given the same chamber pressure. Without proper adjustments to system, it can cause issues of different sorts too.
I have been loading with Ramshot hunter for ar10 in .243 win. I like it better than the other faster burning powder I was using. I plan to try even slower powder if I get hold of some.
-TL
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