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Be aware that you ARE outside the manual and do so at your own risk. The 60% loading applies ONLY to hogdon 4895, no other powder.

That being said, I would pick a normal velo load and chrony it,...

I think it's a lawyer-proof thing, they don't want to tell their customers that they're idiots and probably pulled the trigger on an obstruction.
I wouldn't load down any super slow powders,...

I'm rather tired of hearing this myth, and the internet's allowed it to propagate far and wide. "Flashover", "detonation" or "secondary explosive effect" or whatever it's attributed to. ...