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how wide are your nodes?

 
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Old 08-22-2008, 12:32 PM
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Re: how wide are your nodes?

NODES??????

Sound like a personal question and I don't kiss and tell!!!!!!!!!!! lol
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Old 08-22-2008, 01:52 PM
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Re: how wide are your nodes?

Sweet spot in your powder charge..
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Old 08-25-2008, 07:30 AM
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Re: how wide are your nodes?

For a .308 sized case mine run about a half grain. If I shoot groups on either side of the middle I get accuracy almost as good but not quite. I think a wider node is always better because it allows for fluctuations in ambient temperatures and other factors.
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Old 08-25-2008, 11:19 AM
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Re: how wide are your nodes?

In my 7-08 with H-414, it's +- .2 grain or less. Very narrow. +- .5 grain doubles the group size. Varget appears to be slightly less sensitive, maybe +- .3 or .4 grains. Haven't shot it enough to be positive. My .30 x .378 is also surprisingly touchy. +- 1 grain of H-5010 (112 gr node) also doubles group size. Have just started experimenting with US 869. My impression is that it's not as sensitive, so I am concentrating on it.

Plausible conclusions: different powders can give a wider or narrower accuracy charge weight range, and a 1/2 percent total variation in charge weight is too much for these 2 rifles.

Good hunting, Tom
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Old 08-25-2008, 12:26 PM
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Re: how wide are your nodes?

I've always weighed every load on a beam balance scale, but I usually do load development in .5 grain increments, then fine tune up and down by .2 grain increments. For smaller rounds like a 6mmBR Iíve found +/- .2 to be pretty standard, but for larger 308 and up, +/- .5 is a reasonable number.


In knowing this, I would be interested to see what consistency some of the higher end powder throwers get and how close to the node variations they would stay?
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