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powder charge vs velocity

 
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  #36  
Old 05-24-2012, 08:10 AM
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Re: powder charge vs velocity

BML, how far is it from your muzzle to your chrony????? It could be the more powder pushed out is messing with the sensors = miss reads???
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  #37  
Old 05-24-2012, 08:11 AM
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Re: powder charge vs velocity

I would concentrate on 49.5-50.5 if I was you. Either that or find a lower node that will shoot with a better ES. If you are determined to get it over 3000, use another powder, Re 22 or Hybrid 100V will get you there more than likely.
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  #38  
Old 05-24-2012, 08:30 AM
BML BML is offline
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Re: powder charge vs velocity

I set up the chronograph 10 feet from the end of the barrel. I'm not really concerned with reaching a specific speed. Accuracy is most important but I do want to make sure I can maximize my speed without losing any accuracy. If that speed happens to fall in the 2800's somewhere I'm ok with that. If its closer to 3000 that's just an added bonus as far as I'm concerned.
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  #39  
Old 05-24-2012, 09:03 AM
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Re: powder charge vs velocity

Quote:
Originally Posted by BML View Post
I set up the chronograph 10 feet from the end of the barrel. I'm not really concerned with reaching a specific speed. Accuracy is most important but I do want to make sure I can maximize my speed without losing any accuracy. If that speed happens to fall in the 2800's somewhere I'm ok with that. If its closer to 3000 that's just an added bonus as far as I'm concerned.
Might want to back that away from the muzzle another 5 to 10 feet. You are definitely getting muzzle blast. That has most definitely been a good portion of your erroneous readings.
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  #40  
Old 05-24-2012, 11:28 AM
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Re: powder charge vs velocity

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Originally Posted by brentc View Post
Although it may not always show a consistent drop in MV, it certainly doesn't show a consistent increase. When the data is analyzed it's either a very slight increase or decrease from the previous powder charge, indicating the plateau, or more simply it shows the point of diminishing return where more powder is gaining you very little or no performance increase with the increased pressure and brass wear.
Ageed.

I think diminishing returns (plateau as you put it) was MikeCR's point.

With enough powder, you could start setting your lugs back or experience case head separation which would probably cause a statistically significant decrease in MV provided you live long enough to collect enough samples.

-- richard
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