I've never used #9 powder, but do load for 454. My first idea would be try different powder, or perhaps a Magnum SR primer. I'm not sure if #9 is hard to ignite as I've never tried it.
I do know that all the powders that are good for 45 Colt are good for 454. I have good luck with 2400, Unique, 2400, and (Bullseye in light loads.)
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