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Cannot reduce powder drop

I am attempting to adjust the amount of powder dropping for 45 ACP to around 5 grns on my 550B. I have the small powder bar installed. I have turned the bolt counter clock-wise as far as it will go and am still getting ~10 grns per pull.

I just switched over from loading 223 and am wondering if I broke something.

Thanks for your help.

Have you removed the small powder bar from the measure and turned the bolt both directions to make sure that it is opening and closing normally? If so, is there a limit to how far it will close? The small bar should go way below 5 grains with just about any powder. What powder are you using?

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