Chargemaster inserts

I have the chargemaster and use it nearly every day, I also cut down a ink pen that slips up in the tube of the chargemaster and with the tapered end it got my charges much closer.

Now for a report that is shocking the chargemaster reports consistency to +/- .1 grn that's .2 grns of spread. It may read 27.5 grns but is it actually? I bet 95% of the time its not. I also use a lab grade scale that measures down to .01 grns with accuracy of +/- .01 grn. I use the chargemaster to throw my charges and then dump the charge into my lab scale and adjust accordingly to 1 kernel of powder. I have to add or take away kernals on nearly every charge and yes I have mine also calibrated to speed it up with the settings. That did help as well as how accurate it dispenses, but no matter what the load cell in the rcbs chargemaster just isn't designed for the competitive shooter in mind. +/- .1 grn may be ok in larger cases such as magnums and so forth but when you have .2 grn spreads in sm all cases like the BR and the likes that makes a big difference in ES and accuracy.
 
James, theoretically there should be 0.1 spread should it not? For example ,say at 30 grains, if the scale throws 29.96 it will read 30.0, if it throws 29.94 it will read 29.9. If it throws 30.04 it will read 30.0, if it throws 30.06 it will read 30.1. So what it is displaying is +/- 0.05??
 
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Actually what I've seen is say you throw 30.0 grns based on transferring to my other scales the charge that reads 30.0 on the RCBS can read as low as 29.7 grns and as much as 30.4 grns but the RCBS says it's 30.0

An example of powder per kernel I've been using a lot of Varget here lately and 1 kernel weighs .02 grns so for me my 30.0 grn charge will be 29.09-30.01 now my load cell accuracy is +/-.01 grns so if I had a scale that went to .000 grns I could still be off by as much as .025 grns overall now that's just an assumption as I don't see the need to break down my charges to 3 places when kernels of powder weigh more than that.

But back to the RCBS that load cell reading can be off as much as much as 35 kernels of powder if one is using Varget. Now to some that don't sound or may not be much but in tiny cases and shooting long range BR all that adds up to consistency. So just remember no matter what the scale is reading on the RCBS unit it still can be wrong because of the sensitivity of the load cell.

If it were a true +/- .1 then you're still looking at +/- 10 kernels of powder if using Varget.

Oh one other thing, I have all my scales and electronic devices run thru a UPS that also filters the current so I have clean and steady current to my devices.
 
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I also like to add, since is did do the ink pen (straw) method my charges have been much closer than just the stock form. My pen is cut to aproximatly. 1.5" long and I chamfered the inside of it a bit on the leading edge or intake side of the pen. I did go into my settings and altered the parameters to the speed of the device.he reason I chose an ink pen was that it tapers down and doesn't let the device drop clumps of powder at one time. Most I have seen it drop at once has been 2 kernels where as before it drop 6-8 kernels. Usually 4 out of ten charges are within my +/- .01 grn spread on my analytical scales. That's just as close as I can make it work.
 
Is the insert taperd?

If not, I wonder if tapering it from rear to front might get some speed back? I will make one and see, when I get a chance. Looks like the size difference from the RCBS tube and insert might create a choke, and stack up powder?

P
 
Dick Grosbier said:
It is a very nicely machined little addition to my Chargemaster, but with H4198 for my 30BR it greatly slows down overall speed.
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I loaded some 30BR last night with H4198 and it seemed to take only slightly longer that LT32 and had no errors. But that was just 19 rounds to test so not an exhaustive test. I'll be loading about 50 rounds after lunch so I'll see how that goes.
 
Pete Wass said:
If not, I wonder if tapering it from rear to front might get some speed back? I will make one and see, when I get a chance. Looks like the size difference from the RCBS tube and insert might create a choke, and stack up powder?

P
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I get a back up of powder maybe every 200 throws. I have one of those stems from the long stem cotton swaps I keep next to my thrower to push up into the tube to clear the blockage. What you're wanting to do is funnel the powder down to as close to single kernels as possible opening up the intake side will only create more blockage if you funnel down on the dispensed end.
 
I see what you mean

James n TN said:
I get a back up of powder maybe every 200 throws. I have one of those stems from the long stem cotton swaps I keep next to my thrower to push up into the tube to clear the blockage. What you're wanting to do is funnel the powder down to as close to single kernels as possible opening up the intake side will only create more blockage if you funnel down on the dispensed end.
Click to expand...

Hummm- - - , I have one of those electronic vibrating trucklers - - more thinking to do I guess.

Pete
 
I do the same

James n TN said:
I have the chargemaster and use it nearly every day, I also cut down a ink pen that slips up in the tube of the chargemaster and with the tapered end it got my charges much closer.

Now for a report that is shocking the chargemaster reports consistency to +/- .1 grn that's .2 grns of spread. It may read 27.5 grns but is it actually? I bet 95% of the time its not. I also use a lab grade scale that measures down to .01 grns with accuracy of +/- .01 grn. I use the chargemaster to throw my charges and then dump the charge into my lab scale and adjust accordingly to 1 kernel of powder. I have to add or take away kernals on nearly every charge and yes I have mine also calibrated to speed it up with the settings. That did help as well as how accurate it dispenses, but no matter what the load cell in the rcbs chargemaster just isn't designed for the competitive shooter in mind. +/- .1 grn may be ok in larger cases such as magnums and so forth but when you have .2 grn spreads in sm all cases like the BR and the likes that makes a big difference in ES and accuracy.
Click to expand...

I try to keep my loads to within .oo-+.02. I figure the float will take care of the rest.

Pete
 
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