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Old November 11, 2010, 09:22 PM   #1
glock907
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Join Date: November 11, 2010
Posts: 4
consistant muzzle velocity =help

i can not get a consistant figure in bullet velocity.
i am loading
30.06 cal
168gr bthp
imr 4064 powder - 48.3 gr
electronic scale
federal primers

velocity varried between 2364 - 2957 all with the same above

any help
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Old November 11, 2010, 09:28 PM   #2
GeauxTide
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Join Date: April 20, 2009
Location: Helena, AL
Posts: 3,050
Wow, never have seen that wide a velocity spread. Are all your cases the same brand? What is the rifle? What kind of electronic scale? My DPS3 has to have the 30 minute warm up to be accurate. I also re-zero after 10 loads of rifle. 4064 has been the most consistent powder for the three '06 rifles that I've owned. Typical spread is about 25fps.

One other thing. I've never seen an '06 with any 165 -168 that runs over 2940. You could have a chrono problem.
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Old November 11, 2010, 10:02 PM   #3
bfoosh006
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Join Date: February 17, 2009
Posts: 340
When using a Chrono... it is very important that it is set up at least 15 feet away from the muzzle, if you don't then you'll get "wierd" readings... also make sure your light source ( I assume the sun in this case.. ) is consistent.

Make sure you aren't crushing the primers when you seat them... that will also lead to odd velocity figures.
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Old November 11, 2010, 10:05 PM   #4
glock907
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Join Date: November 11, 2010
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yes same cases

I dont know what brand scale at this time - will get back to you on that

since you use 4064 onyour 06
what charge would you use for a mv of 2700
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Old November 11, 2010, 10:32 PM   #5
glock907
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Join Date: November 11, 2010
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i will try that had it at about 10 paces
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Old November 11, 2010, 10:55 PM   #6
bfoosh006
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Join Date: February 17, 2009
Posts: 340
And replace the battery on the Chrono... don't forget, shoot when its sunny.

Good Luck !
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