Shooters app adjust

chrismc

chrismc

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I have 3 different apps for shooting - JBM, Strelock, and Ballistics - all great apps imho, altho my preference is Strelock.
Anyhow, the one thing all the apps did was be very inaccurate at long distance trajectories - i made sure i plugged in ALL data, like everything - in hopes in would be a bit more accurate -
There was still 2-3 MOA discrepancy at 1000yds... I did a 200 zero, then 600, then 1000. 4 different rifles.
Soo.... the fix - as i read here, i tweaked the BC of the bullets to somewhat bizarrely crazy numbers - and after a little trial and error with this, i managed to get them to match to within 0.25MOA at 400-600-800-1000yds.
The most accurate without tweaking was the 308w 175 smk, and the most tweaking needed was on a 107 SMK 6mmBR

So, when the temp cools off a bit, i will go check again that the numbers are true - of course, plug in all the appropriate data...
Fingers crossed...
 
I was reading that G1 BC's are very inaccurate at modeling the long, high BC bullets used in long range shooting. It said G7 BC's provide more accurate ballistic models.
 
I have to spend more time on these app's.

I had the same issues in Edson 2 weeks ago. I have Shooter app and applied Ballistics. I have never shot past 600 meters with this rifle before.
Like you,every thing was entered,current conditions. On paper at the range 100 to 500 bang on with both apps. Then there was a stage with a target at 1000.
Shooter gave me a 8.4 Mil , Applied Ballistics gave me a 8.9. Partner got me on target on 4th shot, 3 more impacts (7 round stage). My dialed dope ended up a 7.4. I'm shaking my head on this one. lol A bit of a head wind, but 1.5 mil difference at 1000 meters. wow

G1 to G7 didn't fix it.
 
And this is why real world confirmation of your trajectory is very important.

Something as simple as TRUE twist rate can have a substantial effect on your down range trajectory... then there are more obvious corrections from optics and how you follow through on the shot.

Many bullets will change their BC as their speed changes... Sierra lists these changes. BC will also change from barrel to barrel.

Unfortunately, not everyone gets to shoot to the furthest distance to adjust their drop charts but it is really the only way to know for sure what is going to happen.

Jerry
 
Yes, two of the apps offer trajectory validation (i used them on Strelock and Shooter) - but even with that, the values given are still not that accurate at long range - the only thing that made the charts match reality was to tweak the BC of the bullets - prior to that, all values were adjusted properly, scope height, temp, humidity, spin, as well as calibrate trajectory- and still they were out quite a bit.
As mentioned, these things are quite accurate up to 500-600 yds, but not so much after that - its close, close enough to walk your shots onto target - but not close enough for 800yd+ cold bore hits until you tweak for your rig(s)
 
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