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Author
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Topic: Accuracy/ readability/ tolerances
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Doggitter
Knows what it's all about
Member # 489
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posted April 05, 2005 09:10 PM
Would like it if a smart person would learn me something. If I am relaoding and want to have a 15 grain load with .005 grain accuracy, wouldn't I also need a scale that reads to .005 grains or less? Could you explain tolerance and what it would be(in number form please) for that sample? I don't think I know what tolerance and readability mean.
I can let 15.5 grains go and 14.5 grains go, isn't that a 1 grain tolerance? ??
This almost theoretical, and I know noone loads to that accuracy, and I set the thrower and check it once in a while. Good enough for what I do.
Wierd, I got a message that said cannot post due to the subject having a word more than 30 characters long. I put spaces in it but... huh???
[ April 05, 2005, 09:12 PM: Message edited by: Doggitter ]
Posts: 273 | From: Oregon rain forest | Registered: Dec 2004
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Leonard
HMFIC
Member # 2
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posted April 05, 2005 09:43 PM
Seems like almost any powder scale claims accuracy to within a tenth of a grain? I believe they need to be (at least) that accurate, but if you are throwing charges, you need to practice your movement so that it is exactly the same, every time. I like to throw ten, weigh the whole thing and divide by ten. That gives you some idea of how consistantly you are throwing your charges.
Other than that, I'm not sure what you want to know?
Good hunting. LB
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EL BEE Knows It All and Done It All.
Don't piss me off!
Posts: 31449 | From: Upland, CA | Registered: Jan 2003
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Tim Behle
Administrator MacNeal Sector
Member # 209
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posted April 05, 2005 09:45 PM
What do you need a tolerance of only .005 for? Top Bench rest shooters don't even go that tight.
You will never be able to shoot the differance in .1 grain. At least never in a hunting situation, and probably not in a bench rest situation. The wind and how you hold the rifle from shot to shot will have more impact than .1 grain of powder.
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Personally, I carry a gun because I'm too young to die and too old to take
an ass kickin'.
Posts: 3160 | From: Five Miles East of Vic, AZ | Registered: Jun 2003
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Doggitter
Knows what it's all about
Member # 489
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posted April 05, 2005 09:51 PM
Benchers shoot about 30 grain loads, right? 30 grains with a +/- .1 grain accuracy. Half the powder charge should go to half the variation too??? .05 grain. And this actually a 11.5 grain load so the tolerance should be even less?
Posts: 273 | From: Oregon rain forest | Registered: Dec 2004
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Jack Roberts
Knows what it's all about
Member # 13
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posted April 05, 2005 10:06 PM
.005 gr accuracy would only be possible after spending hundreds of thousands of dollars to achieve it and be a total waste of money.
Benchrest shooters never weigh charges, it just does not matter at ranges out to 300 yards. Even 1000 yard shooters only try to get within .100 gr.
Jack
Posts: 499 | From: Elko NV formerly MD | Registered: Jan 2003
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Tim Behle
Administrator MacNeal Sector
Member # 209
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posted April 05, 2005 10:09 PM
Most scales will show to .1 grain Therefore if you load every charge to show 11.5 on the scales, you are actually going to be +/- .05 grain
I'm a lot more finicky than I need to be on most of my loads. But my 17 loads are with in .1 My 22, 243 and .284 are with in .2 and my 30's are with in .3
All handgun loads are dumped as well as most 7 mm hunting loads.
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Personally, I carry a gun because I'm too young to die and too old to take
an ass kickin'.
Posts: 3160 | From: Five Miles East of Vic, AZ | Registered: Jun 2003
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Doggitter
Knows what it's all about
Member # 489
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posted April 06, 2005 06:15 PM
Ok, now I'm understanding something. An electronic scale rounds up when above .05 and down when below .05 so it has to be within .05 if the same charge shows on every throw. Thank you very much Tim.
[ April 06, 2005, 06:17 PM: Message edited by: Doggitter ]
Posts: 273 | From: Oregon rain forest | Registered: Dec 2004
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