Chargemaster Results

[1066]

Since then I have not had one over or under throw in over 400 throws. )

I think the point is Dwight that although the numbers say it's dead nuts on every time, measurement shows that it can be 1/4 grain out and still say it's bang on.
Whether that .25 grain makes much difference is another debate altogether.

Right, I agree with this. So then my question is, how do you know how accurate the measuring scale is that is checking the Chargemaster? If I wanted to get that match ammunition ready for a big match, which scale is then the best for accuracy? And then, how do you confirm that? I gotta think that at some point, the propagation of error is amongst other variables that you will NEVER be able to obtain a completely accurate measurement of the weight of your powder charge.

I'm not so much worried about weight as consistency. I do know that variations of 1/4 grain show up as significant deflections on my beam scale. That's about 12 kernels of Varget.

https://www.youtube.com/watch?v=g8VMBJXfYDE

 

[masterblaster1]

You should run the test again after spraying the pan and the pan holder down with static guard, I read it here and tried it, my over throws are 1 in maybe 100 or even less. But this is measured against another cheapo scale with a cheapo calibration weight, just give it a try to reduce one more possible variable, static electricity.

 

[mikecr]

That an out of the box CM mis-charges while indicating desired charge was known ~5 minutes after it hit the shelves.
Many of us tweaked/modified ours, and learned how to use a CM,, some to single kernel accuracy.
Bottom line, you'll do the same, or not.

 

[dantiff2]

First off, I do not use a ChargeMaster. Looking at these results I was actually very impressed. This is a mass produced unit that has a fairly broad tolerance. I know people that use these alone with no other means of confirming weight and have super low ES and SD numbers. I use an older Lyman DPS myself and have seen my ES numbers down in the single digits when measuring velocity's of my BR loads. I recently fired a ten shot string with my XC with an ES of 14 fps using 38gr of H4350 thrown from a DPS scale. How much better can you get? That's for people with a lot more money than me to decide

I think for the average Joe. This is more than suitable to keep them competitive. Hell, short range guys get good results with clicks from a thrower and never even weigh the charge..

Has anyone done a similar test with the Lyman DPS unit? I would be very curious to see what the outcome is. I bet it is around +/- .2gr. The DPS is the highest precision instrument I can afford. It gives me very little vertical dispersion and very low velocity spreads so I just cant justify another scale to check my scale..

Dan

 

[1066]

First off, I do not use a ChargeMaster. Looking at these results I was actually very impressed. This is a mass produced unit that has a fairly broad tolerance. I know people that use these alone with no other means of confirming weight and have super low ES and SD numbers. I use an older Lyman DPS myself and have seen my ES numbers down in the single digits when measuring velocity's of my BR loads. I recently fired a ten shot string with my XC with an ES of 14 fps using 38gr of H4350 thrown from a DPS scale. How much better can you get? That's for people with a lot more money than me to decide

I think for the average Joe. This is more than suitable to keep them competitive. Hell, short range guys get good results with clicks from a thrower and never even weigh the charge..

Has anyone done a similar test with the Lyman DPS unit? I would be very curious to see what the outcome is. I bet it is around +/- .2gr. The DPS is the highest precision instrument I can afford. It gives me very little vertical dispersion and very low velocity spreads so I just cant justify another scale to check my scale..

Dan

Laurie Holland did a review of the Lyman DPS some time ago in the Targetshooter magazine.
http://content.yudu.com/Library/A1ro0k/TargetShooterApril20/resources/52.htm

 

[dalej]

I have been using a Chargemaster for many years for weighing and dispensing powder for my reloading needs. Recently, I purchased a Sartorius Entris scale to fine tune my powder loads and consistency for long range Fclass. I use my Chargemaster to dispense my powder charge minus 0.1g, then use my Omega trickler to arrive at my final load. Earlier this week, I wrote down 50 charges dropped with my Chargemaster and what they weighed on the Entris scale to the nearest 0.02 grains. Here is the data using H4350 set up to drop 51.6g:

Have a ChargeMaster, but only use it for ladder test charges, and use the CM scale for bullet weights, jacket weights and core weights, etc. For all my loading use a Harrells powder measure and RCBS 10-10 tuned scale to top up slightly under-weight charges. Harrells PM is quicker then waiting 45 secs for the CM to do its thing. How would charges weighed on a tuned 10-10 scale compare to your Sartorius Entris?

 

[dantiff2]

Not to take away from the matter at hand but:

It sounds like we all use a chronograph to verify our results of what constitutes an accurate load via low ES numbers. How can we verify the accuracy of the chronograph?? I throw my charges from a powder dispensing system that is no where near as accurate as the scales that some of you fellas are using yet I see some pretty low deviations on the chrony and low (less than 1/4 moa) vertical spread on target so I do believe the numbers that I'm reading. Just another variable...

 

[Milo 2.0]

I have been using a Chargemaster for many years for weighing and dispensing powder for my reloading needs. Recently, I purchased a Sartorius Entris scale to fine tune my powder loads and consistency for long range Fclass. I use my Chargemaster to dispense my powder charge minus 0.1g, then use my Omega trickler to arrive at my final load. Earlier this week, I wrote down 50 charges dropped with my Chargemaster and what they weighed on the Entris scale to the nearest 0.02 grains. Here is the data using H4350 set up to drop 51.6g:

Have a ChargeMaster, but only use it for ladder test charges, and use the CM scale for bullet weights, jacket weights and core weights, etc. For all my loading use a Harrells powder measure and RCBS 10-10 tuned scale to top up slightly under-weight charges. Harrells PM is quicker then waiting 45 secs for the CM to do its thing. How would charges weighed on a tuned 10-10 scale compare to your Sartorius Entris?

I'd say a tuned 10-10 is probably a good system. It's funny how we run ladder tests, ocw's, and then still strive for exact charge weights. I do it myself, so not poking here.
I'd also say in the precision , measuring world today, not reloading, a 10-10 of any kind most likely not the scale of choice. If I was that concerned about knats ass stuff, I'd have a lab grade scale. CM's work fine here.

 

[BoydAllen]

With my tuned balance scales, it is easy to see that one is out of balance by .05. The main issue is that to be read at the higher levels of sensitivity that tuning makes available, some sort of magnification becomes important. If a chargemaster is valuable at +-.1 why wouldn't a scale that can be read to .05? I realize that there are issues when one has requirements for absolute accuracy, as contrasted with mere sensitivity and repeatability, but for reloading, as long as the same scale is used for all weighing, and it is reasonably linear, I don't see a problem.

 

[Snuggie]

Gentlemen, let me say that yes, I have no verticle dispersion.....unless the wind is howling!! I'm shooting an 80 SMK. Also, I completely agree that even though the CM says it's dead nuts on that it could very well be off as to the EXACT weight. I'm just not having big problems....yet. I think I will eventually get a more sofisticated scale. At the moment I cannot decide which is the best bang for the bucks....pun intended. Appreciate all you guys input. Great thread! Best regards, Dwight.