I think you might find a single kernal or flake of powder weighs more than the precision you are demanding. This alone will make your goal unattainable without splitting kernals or flakes of powder. It is also a goal that has no practical, or even discernable effect on velocity or accuracy of the finished ammunition.
Jerry Liles
If you want the most consistency you can get out of a press mounted powder measure, you need to use one with a case activated powder drop. You will get more consistent results using that method than any other. In addition to the case activated powder drop, you will need to deliberately select a ball type powder that meters better out of a powder measure.
Of the available economical measures, the RCBS Uniflow with a case activated powder measure works the best on a Lee Turret presses because the Uniflow is of low enough weight to balance well during the press operation and is as consistent as it can be if the case activated powder drop and appropriate cylinders are used. I have been very satisfied with my loads using these described components and a Lee Classic Turret press.
IF, however, you are not satisfied with the results you get from a Uniflow/case activated powder drop combination, then your best approach is to either use a funnel, trick your charges, weigh them individually and drop them with a funnel in your die or spend the money and get a Quick Measure setup.
Ain't gonna happen. If you can find one that does .1gr, be ecstatically happy.Quote:
No, I'm saying 2 hundreds of a grain, friend...that's what I'm wanting.
What scale are you using that will weigh to within 2 hundreths of a grain.....I want one (if I can afford it)...one that will consistantly measure to a tenth of a grain is very good and more than adequate for measuring powder for handloading...good luck in your search..Quote:
Originally Posted by daddyseal
To get that close you will have to throw a light charge and trickle up to that weight.
When you have a powder that is matched for the cartridge you can get away with +/- .2 grains.
What you do is work in 1% increments and plot the velocity on a chart. Where you see almost no gain in velocity between charges is you sweet spot. I learned this a long time ago with a Remington 40X in 222 Remington. I still have the chart where I used 19.6 grains of IMR 4198 with a 55 grain bullet.
At one time I use to think that if I had the powder charge measured to the last .01 grain it would equate to accuracy. Not even close, add to that low extreme spreads over a chronograph do not take into consideration barrel vibrations. These are just means of getting there a little faster, the TARGET is the real truth teller.
What are you shooting that you feel needs that amount of precision?
Well, that answers that...short and sweet.Quote:
Originally Posted by jeff423
If there was, I probably couldn't afford it anyway~
You do realize that for Stick powders .01gr is a Partial stick?
Even the Flake powders are more than .01gr per flake.
No mechanical measure will throw a charge that accurately, they work by volume not weight.
Pure randomness of how the powder fits in the chamber prevents the accuracy you wish.
I like their design.Quote:
Originally Posted by DaveInFloweryBranchGA
How about this Hornady?
http://www.midwayusa.com/product/591344?cm_vc=S014
daddyseal said,daddyseal,Quote:
Mine reads consistently to .002 gr
Do you have your scale in an enclosure that shields it from air currents? Is your scale on a surface that is completely isolated from vibration? Is the room in which your scale operates, climate controlled? What class of calibration weights are you using? Your calibration weight would have to be at the very least, class 4.
Without all of these conditions it would be impossible to guarantee or maintain 2/1,000ths of a grain accuracy.
smokeywolf
I enjoy using a old Redding powder measure with 2400,4227,bullseye ......to a tenth or two.
Horace
Since you specifically limited this to a press mounted measure I will tell you that is, in itself, impossible. Every time you cycle your press your measure bounces or moves some. This creates variance in the packing of the powder each time, because 1) the vibration is not consistent, and 2) every time you release a load of powder the remaining powder flows into that space so you cannot create a 100% pack each time.
I no longer mount a measure to a press, but then I load every cartridge individually. What are you loading on a progressive that you think needs that level of accuracy?
No, yes and yes.Quote:
Originally Posted by smokeywolf
Don't know class of calibration.
Manufacturer said it weighs too .002, but only displays to .01...sorry about my statement of more accuracy of my scale. I'd be very happy with consistent .02 gr loads!
If I put a powder baffle in it, won't that solve nearly all of the movement issue?Quote:
Originally Posted by Wayne Smith
When I start reloading for my rifles, I'll bench load too.Quote:
I no longer mount a measure to a press, but then I load every cartridge individually. What are you loading on a progressive that you think needs that level of accuracy?
A while back one of the magazines ran a test to see which powder measure was most consistant including some top end ones, and lo and behold, the Lyman 55 won out. i'm not sure what the actual amounts were.
Thanks...I'll look at it.Quote:
Originally Posted by MT Chambers
I don't think that any measure subjected to the vibration of a reloading press can perform as accurately as you have requested. Even a tenth is asking a lot for anything mounted on a press. I keep my powder measure and scale on a separate table, isolated from the shaking of the loading process. Its been my experience that even a Harrell or Neil Jones measure needs to be operated very consistently to perform to within a tenth, and that's with easily measured powders.
What is the brand and model of your scale?Quote:
Originally Posted by daddyseal
My lab scales that measure in that 0.002 grain range (0.0001 grams) are very expensive !
Jerry
Obsess over something important.
Gear
This one, but got it for $78 someplace else.Quote:
Originally Posted by 1bluehorse
http://www.digitalscalescenter.com/a...g%20x%200.001g
Easy mistake to make.Quote:
Originally Posted by daddyseal
That scale is advertised as .001 grams (g).
.001g = .015gr (grains)
But a common ploy sellers "of digital scales" use is they round off to what looks best on paper to buyers, with more likely best accuracy on a cherry picked unit of .01gr, which converts to .0006g rounded up to .001g. Also note that accuracy is usually measured around the middle scale ranges, not at either extreme, so while at a midpoint of 10 grams (150 grains), it "might" have .015gr accuracy, at the extreme ends of the scales range it might drop to .5gr accuracy.
It is a Chinese scale that is sold at Amazon for $50.
A quick look at reviews there shows this is like most of the low end Chinese scales, and is not the best choice for reloaders. This comment is an example of typical with many digital scales: "takes at least about 14mg for the scale to register weight", and 14mg (milligrams) equals .2gr (not .02)., which is about normal for many digital scales.
or this:
"The scale is definitely accurate to +- 3mg or better as claimed in the manual, but like the Gemini 20 it has problems registering very light things. It's just completely off under 10mg, with accuracy increasing up from 10mg to roughly the 25mg mark." (10mg = .15gr)"
http://www.amazon.com/American-Weigh...DateDescending
If you seek consistency as a priority, dump the digital scales.