Drop Chart Help?

ovastafford

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Joined
Oct 23, 2009
Messages
1,340
Location
Oregon
Whats up guys, I have been trying to do an updated drop chart for my gun and Im getting different answers for velocity from three different programs. I was going to see if I could get somebody to run my drops through their program and see what they get?
Heres my data:

6.5x284 140gr Berger VLD, 8 twist barrel

728 yards 200 yard zero, 14.6 moa up.
1010 feet elevation, 84 degrees, 56% humidity, scope height 1.75".

I think that's everything,

Thanks
 

SBruce

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Oct 31, 2009
Messages
1,785
Location
Thunder Basin, WY
Exbal gives 2834'/sec.
 

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Clark

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Joined
Oct 19, 2006
Messages
761
QL thinks 2864 fps muzzle with .264, 140, Berger VLD #26401- 504

QL thinks it cannot be done with .264, 140, Berger VLD G7 #26501
 

Greyfox

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Joined
Jan 21, 2008
Messages
5,815
Location
Northeast
Whats up guys, I have been trying to do an updated drop chart for my gun and Im getting different answers for velocity from three different programs. I was going to see if I could get somebody to run my drops through their program and see what they get?
Heres my data:

6.5x284 140gr Berger VLD, 8 twist barrel

728 yards 200 yard zero, 14.6 moa up.
1010 feet elevation, 84 degrees, 56% humidity, scope height 1.75".

I think that's everything,

Thanks

I use Ballistic FTE, G7 Br2 RF, and, BOTW, and NF. Get the similar data using all programs. I use G1. I also shoot and have field tested actual drops with my 6.5x284's. For your conditions., at 2832FPS I get a drop of 14.58. I am using around 53 gr. of H4831sc. I get 2941 FPS with this load in my Savage LRH.
 

ovastafford

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Joined
Oct 23, 2009
Messages
1,340
Location
Oregon
I appreciate all the responses. My Chronograph was giving me around 2900 average. Of course that was on a different day conditions etc. My load is 51.9 grs of 4831sc lapua brass around 20 thou off the lands. My barrel is a 26" Brux 8 twist.

I know this powder is not very temp sensative but how much velocity change can I expect going from say 105 degrees to 85 and all the way to 30 degrees Fahrenheit?

Thanks
 

Greyfox

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Joined
Jan 21, 2008
Messages
5,815
Location
Northeast
I appreciate all the responses. My Chronograph was giving me around 2900 average. Of course that was on a different day conditions etc. My load is 51.9 grs of 4831sc lapua brass around 20 thou off the lands. My barrel is a 26" Brux 8 twist.

I know this powder is not very temp sensative but how much velocity change can I expect going from say 105 degrees to 85 and all the way to 30 degrees Fahrenheit?

Thanks

I don't know what the velocity difference is but I have found that under 500 yards my impact for hunting is negligible. One click downward for each 25 degrees colder out to 700, 2 for each 25 between 700 and 1000. My clicks are .33moa. This works is for me with my turrets.
 
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