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Old 10-19-2020, 09:34 PM
horsepower horsepower is offline
 
Join Date: Nov 2009
Location: Outside High River
Posts: 315
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Quote:
Originally Posted by AndrewM View Post
Do you notice if velocity nodes correspond to accuracy nodes? Basically to keep wind and everything else out, could you use a chrony and get similar results?
I have noticed that a gun will have many accurate nodes throughout the velocity range. Nodes will vary in size where some are large and lenient, and others are small and finicky. There will several nodes when looking at overall length as well as looking at powder amounts. The trick is reading the data and finding them.

I have missed nodes completely with too large a jump in powder or seating depth increments. I have chosen 0.003" increments for this reason. Dean has chosen 0.005"-0.010" while others choose 0.025" and 0.030". Too small an increment are you wasting resources, too large an increment and you miss things.

In the past I used a beta chrony and noticed potential for erratic results based on cloud cover and other environmental condition. While good info could be gleaned from the data, I now use a Labradar and feel the information is more consistent and accurate. It is a great tool for finding and maintaining nodes. If my rifle likes 2900fps I will try to keep that velocity. This means reducing powder when environmental temperatures rise, and increasing powder when temperatures drop.
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