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oneatatime
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Got a Harrell's
Nov 3rd, 2019 at 6:36pm
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A Harrell's Schuetzen Measure to be exact. Had to run a test to see if they are really more accurate. Ran it in with half a hopper of 4895 and then 1/4 of a hopper of 4227 without checking anything. What I wanted to compare was my old RCBS with the small capacity drum installed and my micrometer measure. I set the micrometer to dump my 25-20 SS load of H108. Now, if you don't know, H108 seems about the smallest ball powder there is so it ought to be the easiest to measure. After normal hopper shaking and dumping 20 loads, I started the test. I dumped 5 groups of 10 loads each and weighed each group. The average weight was 6.722 grains and the average variance for the heaviest and lightest groups was +.048 grains and -.042 grains. Then the test was repeated with the Harrell's which I set by quick trial to about the same as the RCBS average. It was looking good so I ran it out to 10 groups of ten loads each to see if it would hold. The average was 6.7305 grains and the average variance for the heaviest and lightest groups was +.0095 grains and -.0105 grains. It is a little jewel and I like it!
  
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n.r.davis
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Re: Got a Harrell's
Reply #1 - Nov 3rd, 2019 at 6:59pm
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You ought to send it to me and I can adjust it to run "Dead Nuts" all day long.... Roll Eyes
Congratulations!  One is on my wish list.  David
  
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beltfed
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Re: Got a Harrell's
Reply #2 - Nov 3rd, 2019 at 9:28pm
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Just curious, what balance did you use to check the weights
within .00X grains?
beltfed/arnie
  
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oneatatime
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Re: Got a Harrell's
Reply #3 - Nov 4th, 2019 at 12:10am
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It's what happens when you divide large numbers by 100. I'm sorry, that was flippant of me. I am comfortable with interpolating to a half grain on my powder balance and when dealing with large samples and averages the numbers get funky. I do have a lab balance that is calibrated in 2 mg increments with a vernier to .2 mg which is about .003 grains. The bottom line, of course, was that the Harrell's is more accurate than my RCBS by quite a bit, at least with H108. 4227 or AA5 may be the next test. I don't plan to use it with 4759;-)
« Last Edit: Nov 4th, 2019 at 11:08am by oneatatime »  
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bnice
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Re: Got a Harrell's
Reply #4 - Nov 4th, 2019 at 7:09am
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Great measure! You may want to check out PMA Tool they make some nice accessories for it. I bought the powder bottle adapter works great. 
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marlinguy
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Re: Got a Harrell's
Reply #5 - Nov 4th, 2019 at 10:28am
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I consider my Harrell powder measure the finest loading tool on my bench. And I've never regretted buying mine. I bought a half dozen extra bottles so I could keep my favorite powders in the bottle when I changed from one powder to another. I also marked various pet loads on the outside of the bottles with the number of clicks used so I can pick up a bottle and simply read the side to decide what load I want for the powder.
Can't recall where I bought the spare bottles from now, but they were only about $5 or $6 each when I got them.
  
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oneatatime
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Re: Got a Harrell's
Reply #6 - Nov 4th, 2019 at 10:52am
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Thanks, bnice, those are clever. And a neat idea, Vall.
  
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oneatatime
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Re: Got a Harrell's
Reply #7 - Nov 5th, 2019 at 12:02pm
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As a guide to setting the measure with H108, I threw 10 drops at each major setting (on the shaft) from 2 to 15 which I figured was a good range. Each major setting represents 1 turn of the setting dial. The setting dial has 10 minor settings and there are 4 clicks to each minor setting. With the H108 one turn of the dial was 1.32 grains. Each minor setting was .132 grains and each click was .033 grains. With those numbers I could compute an exact setting for any load I have now but to make it simpler I just made a chart showing the weight derived at each major setting and I can go from there. I love it!
  
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oneatatime
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Re: Got a Harrell's
Reply #8 - Nov 7th, 2019 at 11:59am
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Having now fleshed my chart out to 6 powders I have found remarkably close numbers for 5 of the 6. The 5 are H108, AA5, 4227, 2400 and 5744. The major settings (the ticks on the shaft which equal one rotation of the dial) only vary from 1.20 grains to 1.32 grains (depending on the powder's density and grain shape), the minor settings (the 10 numbered sections of the dial) thus vary from .120 to .132 grains, and each of the 4 clicks of the minor settings thus vary from .030 to .033 grains. 3 hundredths of a grain is not a whole lot. The odd one out, number 6, is of course Unique (the fluffy flying powder) which has a major setting average of only .76 grains. I need to compare the Harrell's and my RCBS with one of my Unique loads.
  
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