Are Bergers' Ballistic Calculator Results out to lunch???

yodave

yodave

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okay so load development with a new 6br has me scratching my head a bit, the ballistic calculator results from bergers website aren't even close to what I am experiencing, so if someone can run these numbers for me for a second opinion life would be grand.

Muzzle velocity is 2820
range elevation is 1200 feet, 0.0 degrees inclination 10 degrees celcius
bullet is a 105 grain Berger hunting VLD bullet with a overly exaggerated BC of .272 (G7)

They show a bullet drop of 13 inches give or take at 300 yards, my lazy bullets are scared to fly and are well below 30 inches low at 300 yards, well okay 300 meters but still I am almost 3 times the bullet drop then they are stating with their online calculator.........

I need to either prove this out with another program or reverse engineer the BC to get to real world results for beyond 300. This phenomenon has been proven now by 3 shooters shooting the same bullet at almost the same speed on the same range with the same crazy gravitational forces.....

If I am missing info needed to make me a new drop chart let me know........
 
total head scratcher now.............

I run a 10 moa base, maybe I should check and make sure it isn't on backwards...........

sightron 10-50x60 scope that tracks like a king
 
Juster said:
If your zero had shifted to 7 yards, that would explain it.
Click to expand...

lol.................thanks for running the numbers, going to have my guys check the forces of the gravity on that range and check the rifle on another range to see what gives, as for now I know I am on at 100 and I just reset the turrets to zero......

The new magneto speed sporter works like a charm and is a real head turner
 
Turn the elevation knob the "other way"...

Sorry, couldn't resist.

How many minutes of up are you adding from 100yds zero to hit at 300m?

I have compared Berger with JBM using both Litz and Berger BC G7 numbers. Values generated are very similar... and are close enough to hit paper.

Confirm velocity.. maybe you are way slower then expected????

Jerry
 
Mystic Precision said:
Turn the elevation knob the "other way"...

Sorry, couldn't resist.

How many minutes of up are you adding from 100yds zero to hit at 300m?

I have compared Berger with JBM using both Litz and Berger BC G7 numbers. Values generated are very similar... and are close enough to hit paper.

Confirm velocity.. maybe you are way slower then expected????

Jerry
Click to expand...

I thought about that, but the bullet finally hit the paper when I was cranking the turret the same way, we found the problem..........





I was shooting at your old range, so between the air pollution and dense heavy air, moisture and fog switching twitchy winds and a flock of unionized onlookers my poor bullets didn't stand a chance........

shot the same load today over the crony, confirmed the velocity at 2820 fps, scope is in 30mm rings on a farrel base, 2 inches center to center, going to confirm things in a couple days in the warm clear air of C.R.
 
Shooter ----/ said:
I am curious about this as well. Is there a possibility of a Mil/MOA mix up?
Click to expand...

scope is a MOA fine target dot, came up 9 or 10 MOA from 100 to hit center of target at 300, could have been 11 MOA or more by the time the dust settled..........

or else my 1/8 minute turrets are running at 1/16 or less...........but it seamed to be right with the lighter bullet loads and held zero out at 600 yards for more then a year.........
 
Did you seat the bullet with the pointy end inside of the case? :)

With my 6br and the 105gr Berger VLD target at 2835fps I'm getting 4.3moa (14.8") of drop at 330 yards (roughly 300 meters).

Unless you are seating the bullets backwards I would say the BC is very close. I find bergers BC's to be closer then any other brand I've tried.
 
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I hope you guys are right...........might have to make the trip back to the 300 line before the weekend
 
scope is a MOA fine target dot, came up 9 or 10 MOA from 100 to hit center of target at 300, could have been 11 MOA or more by the time the dust settled..........or else my 1/8 minute turrets are running at 1/16 or less...........but it seamed to be right with the lighter bullet loads and held zero out at 600 yards for more then a year.........
Click to expand...

Yodave....Recheck your 100 yd zero..there is no way you need to come up 9 or 10 MOA for 300yds... from 100 around 3 to 4 moa at most..

...if you actually do have a 100 yard zero then the issue is your scope..

Confirm by doing a box test at 100 yards...
 
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