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Rifles, Reloading, Optics, Equipment
Reloading
How critical is measuring powder to .01 grains
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<blockquote data-quote="David Urasky" data-source="post: 2784902" data-attributes="member: 108550"><p>From a 1k F class shooter perspective, consistency is the name of the game. What the charge is is not as critical as it being the same every shot. I used an RCBS electronic scale when I started and saw my scores increase when I went to the GemPro. I got tired of having to weight the charge, then lift the pan just a little, let it settle then read the weight. Repeat that after adding or subtracting powder. I had to do that because of the friction in the scale. Then I went to the A&D 120i and now I just add powder and my scores went up again. I can take the pan with powder and move it on and off the scale a dozen times if I want and get the same value everytime. But it does only measure to .02 grains. One piece of Varget weighs about .02 grains. So to get down to .01 grains I'd have to be gutting pieces of powder in half. I use a tolerance of -0.00/+0.02 grains</p><p></p><p>When shooting a Dasher at 1000 yards a variation of 10 fps changes the drop by just about 3". That may not seem like a lot but the X ring is only 5". So holding center X and dropping 3" puts the hole in the 10 ring and out of the X. Change 20 fps and you just dropped a point in the 9 ring. </p><p></p><p>The big boys sort their primers and bullets by weight so they don't change velocity in a 20 shot string. It's not uncommon to have the top shooters with scores of 200-20x and breaking ties by continuing shots until someone misses an X. I had a shooter at my range in a 600 yard match shoot clean for all 5 matches. That means 100 shots in the 10 or X for a score of 1000-62X over 2 days. By the way, at 600 yards the 10 ring is just over 6" with the X 1/2 of that. He could not afford any vartiation in shot velocity. His focus had to be on the wind.</p></blockquote><p></p>
[QUOTE="David Urasky, post: 2784902, member: 108550"] From a 1k F class shooter perspective, consistency is the name of the game. What the charge is is not as critical as it being the same every shot. I used an RCBS electronic scale when I started and saw my scores increase when I went to the GemPro. I got tired of having to weight the charge, then lift the pan just a little, let it settle then read the weight. Repeat that after adding or subtracting powder. I had to do that because of the friction in the scale. Then I went to the A&D 120i and now I just add powder and my scores went up again. I can take the pan with powder and move it on and off the scale a dozen times if I want and get the same value everytime. But it does only measure to .02 grains. One piece of Varget weighs about .02 grains. So to get down to .01 grains I'd have to be gutting pieces of powder in half. I use a tolerance of -0.00/+0.02 grains When shooting a Dasher at 1000 yards a variation of 10 fps changes the drop by just about 3". That may not seem like a lot but the X ring is only 5". So holding center X and dropping 3" puts the hole in the 10 ring and out of the X. Change 20 fps and you just dropped a point in the 9 ring. The big boys sort their primers and bullets by weight so they don't change velocity in a 20 shot string. It's not uncommon to have the top shooters with scores of 200-20x and breaking ties by continuing shots until someone misses an X. I had a shooter at my range in a 600 yard match shoot clean for all 5 matches. That means 100 shots in the 10 or X for a score of 1000-62X over 2 days. By the way, at 600 yards the 10 ring is just over 6" with the X 1/2 of that. He could not afford any vartiation in shot velocity. His focus had to be on the wind. [/QUOTE]
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How critical is measuring powder to .01 grains
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