Re: Dual chargemasters, worth it?
I dispense my powder with two Chargemasters (calibrated with the same set of check weights), that I verify with an Acculab VIC-303 scale. I'm weighing charges on the Acculab and dumping them into cases without ever having to wait on one of them to finish dispensing.
The Chargemaster can be tuned for better performance:
http://www.sahuntingrifle.co.za/index.ph...id=8&id=185
I adjusted the parameters to:
HSP_A1 = 8.00
HSP_B1 = 3.00
HSP_C1 = 1.00
I also use a reducer, that restricts the powder and makes it so that it doesn't come out in clumps when it trickles:
It's made by just wrapping paper around a 3/16" rod until it fits in a Starbuck's straw. I've been meaning to machine a more permanent reducer, but haven't gotten around to it and I've been using this for a couple years now.
One of the biggest enemies of the Chargemaster is static buildup. To cope with it, I wear an anti-static wrist strap that is grounded. This dissipates any charge that is starting to build each time I grab the pan.
If you want to improve the accuracy further, know the weight of your powder pan. When you remove the pan with the powder in it, the display should read -(pan weight). If it's not EXACTLY that weight, it's off. This works very well, I have verified it with the Acculab. My charges are consistently within 0.02 gr. (a kernel) of each other UNLESS that empty tray reading is off, which sometimes happen and is always 0.1 gr. higher (ex: -148.3 vs. -148.4) on my units (zeroing offset/error). Then the Acculab also shows the charge being low by 0.08-0.1 gr.
In most cases, I only need to add a single kernel of powder to make the exact weight. When I get the 0.1 gr. low reading, then I drop in 4-5 kernels. If I didn't have the Acculab, I would just dump that charge back into the top of the Chargemaster.