consistant muzzle velocity =help

glock907 · November 11, 2010, 10:22 PM

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

GeauxTide · November 11, 2010, 10:28 PM

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.

bfoosh006 · November 11, 2010, 11:02 PM

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.

glock907 · November 11, 2010, 11:05 PM

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

glock907 · November 11, 2010, 11:32 PM

i will try that had it at about 10 paces

bfoosh006 · November 11, 2010, 11:55 PM

And replace the battery on the Chrono... don't forget, shoot when its sunny.

Good Luck !

November 11, 2010, 10:22 PM	#1
glock907 Junior Member 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

November 11, 2010, 10:28 PM	#2
GeauxTide Senior Member Join Date: April 20, 2009 Location: Helena, AL Posts: 2,932	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.

November 11, 2010, 11:02 PM	#3
bfoosh006 Senior Member Join Date: February 17, 2009 Posts: 285	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.

November 11, 2010, 11:05 PM	#4
glock907 Junior Member Join Date: November 11, 2010 Posts: 4	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

November 11, 2010, 11:32 PM	#5
glock907 Junior Member Join Date: November 11, 2010 Posts: 4	i will try that had it at about 10 paces

November 11, 2010, 11:55 PM	#6
bfoosh006 Senior Member Join Date: February 17, 2009 Posts: 285	And replace the battery on the Chrono... don't forget, shoot when its sunny. Good Luck !