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Help- Powder Measurer

I have just gotten my 550b, First progressive press and have loaded a few hundred rounds of 10mm and 45 acp. I am now in the process of loading for my 44 mag and heres where my problems are starting. I just received a quick change kit along with the conversion kit. I am having problems with this certain powder measurer or maybe powder. I am using alliant 2400 19.0 grains. The powder bar is the small one. I am checking the weights on my rcbs chargemaster digital scale which I re-calibrated various times during this dilemma. Problem is sometimes it weighs spot on and then off by more then .4 tenths of a grain. A couple times even by 1 whole grain. Also have some powder on the shell plate which I believe might be me ( not pausing enough? ) anyways I have taken the powder funnel out and cleaned it with an alcohol pad along with most of the measurer and also used a dryer sheet to wipe the inside of the powder hopper to rid any static in there. Any other ideas???? Your help would be greatly appreciated.

any thoughts on using the large powder bar ??

I would move to the large powder bar.  A longer cylinder will meter better than a wide/flat cylinder.

Ok switched to the large powder bar for the first time and its all now within .1 tenth of a grain. Just need to know about the white plastic plug that went into the spacer on the small powder bar------Is this white plug only used when using the extra small or small powder die? doesnt seen to fit in the large powder die, anyone???

white plug only needed to secure the spacer in place.

check your charge bar travel. make sure it is returning all the way.

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