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Posted: 5/31/2009 5:09:45 AM EDT
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I have been loading and realized my loads have super high standard deviations.
A friend of mine says to quit using an electronic scale and to through the charges and trickle to the correct load every time. How accurate/repeatable have you found your scale to be? |
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Quoted:
Do you let it warm up for 30 Min? Do you calibrate it each time? Dou you have a draft free enviroment? Do you have any flouresent light fixtures near the scale? Is it Level? The Chargemaster is not like the Lyman, it doesn't need 30 minutes of warm up time. But he does need to check for cell phone/magnetic interference of the scale, a strong draft, level mounting, and should make sure he calibrates it before using it each time. Either that or his chrono is jacked up. |
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Quoted:
Quoted:
Do you let it warm up for 30 Min? Do you calibrate it each time? Dou you have a draft free enviroment? Do you have any flouresent light fixtures near the scale? Is it Level? The Chargemaster is not like the Lyman, it doesn't need 30 minutes of warm up time. But he does need to check for cell phone/magnetic interference of the scale, a strong draft, level mounting, and should make sure he calibrates it before using it each time. Either that or his chrono is jacked up. My Chargemaster is less likely to overthrow if I turn it on for an hour before I use it. |
| I use mine exclusively now. I didn't trust it at first but after weighing every 5 throw on a balance beam for 50 rounds, I said screw it. It was dead on every time. No warm up time. Make sure you calibrate it every time and don't shake the table while it is throwing. I have a florescent lamp nearby (3 feet over head) and have never had an issue. |
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Quoted:
I have been loading and realized my loads have super high standard deviations. A friend of mine says to quit using an electronic scale and to through the charges and trickle to the correct load every time. How accurate/repeatable have you found your scale to be? Are you loading on the lowish side of case capacity? Partially filled cases will increase SD due to lower load densities. The more 'full/filled' a case is, the lower the SDs IME. How are you sizing your cases? Cases with various neck wall thicknesses MAY increase SD due to more, or less, neck tension. I've had a Chargemaster 1500 for three years and it can drift a bit, plus or minus .15 grains, depending on what's falling off the tube's end and when. It does bounce slightly, but that's negligible vis-a-vis SD. Still, with AA-4350 being thrown from my Dillon powder measure, I might be plus or minus .3 grains and the SDs will be in the high teens, or low 20s, at worst. There are other factors that might be the culprit, such as neck tension, primer seating or primer pocket uniforminty, flash hole deburring, etc. Check your scale against a beam scale if you have one and/or use check weights. The powder measure, whether it be a Dillon, RCBS, Lee, Redding or a particular electronic measure, throws what it throws and weighs what it weighs. If it's off by a good deal, then that's your issue. Here's my personal understanding: Factory ammo: SD––20-30, or higher. Loaded ammo just going through the motions: SD––15-20 is decent. Loaded ammo taking my time and fiddling: SD––10-15 is pretty good and I'm happy. Loaded ammo pimping things out and crossing my fingers: SD––5-10, but these are the exception for me. I've loaded rounds with SDs in between 20-30 and I've shot groups with Extreme Spreads of 200 FPS for five rounds chronoed and put those five rounds into less than a quarter at 100yds, so there's really no rhyme or reason to it at shorter distances. Where SDs show up mostly, is anything past 500-600 yds in my experience. Chris |
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