Drop Chart Help?

ovastafford · #1 09-12-2012, 04:41 PM

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

JackinSD · #2 09-12-2012, 05:53 PM

Using the G7 Ballistics Calculator on this site, I get 2846 fps.

runshort · #3 09-12-2012, 09:27 PM

With the data given the Shooter program I have is showing a velocity of 2839 fps

SBruce · #4 09-13-2012, 03:38 AM

Exbal gives 2834'/sec.

Clark · #5 09-13-2012, 04:13 AM

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 · #6 09-13-2012, 06:42 AM

Quote:

Originally Posted by ovastafford

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 · #7 09-13-2012, 10:28 AM

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