rustyshackleford
Well-Known Member
If he had 0.25 inch adj vs .25 MOA he'd be low vs high would be not?
280 AI Ballistics: I need help, I am Confused
- Thread starter rodneymoncrief
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If he had 0.25 inch adj vs .25 MOA he'd be low vs high would be not?
Ga6570
Well-Known Member
I agree, double check scope height. You need to know center of bore to center of scope tube. I say this because my scope tube center in low rings with a 30mm tube are sitting 1.7 above bore center. If you have high rings you are likely much higher than 1.8. Just my thoughts. Good luck. Let us know if you figure it out.
liv4thehunt
Well-Known Member
No scope dials a true .25 per click. We did a square test with a nsx nightforce once that went11"x11" problem is we only dialed 10"x10". We adjusted his speed according, and he has killed 10 plus animals with that scope since. You can also adjust the bullet bc, the manufacturers published number is rarely spot on. Also what direction does your range face? If it's east, then you are experiencing corialis (spin of the earth).
This is my thoughts also. Got a little more than .25 moa per click. Would be nice if ballistics app would allow to tweak the click value in the app to the match scope.
rustyshackleford
Well-Known Member
Can you post a picture of your inputs? I'd almost say hornady undersold their BC's but we know that ain't it
. The way it's slowly diverging seems like a BC or atmospheric error to medemonjigger
Well-Known Member
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- Mar 28, 2017
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Try .26" instead of 1/4 MOA. Also try using G1 BC. If you are using Hornaday bullets, I'd use the Hornaday 4DOF ballistic program.
Good luck.
Good luck.
If scope height and click values all check out then I would adjust the velocity to a faster FPS or raise the bc Input value . Sounds like your load is shooting faster then your input value you entered OR your entered bc is off a touch . I'd try bumping the FPS until your required Moa come up matches your actual at the farther yardage then compare it to the closer settings until it matches actual come up to what you are told come up needs to be . If not reset FPS input value back to the initial setting and you can adjust the bc to match too , most of the time it a very small (tweak) to ( validate ) your info and setup . Sometimes your true zero can be off too . Let's say you have it set up to zero at 300 but you looked at your calculations and it says 3" high at 100 , you can be off or pull a shot to throw you off and 1/8 -1/4" or more of ( bad ) information at 100 can really throw you off down range when you try to validate . What ever you choose your 0 range to be , shoot it there to verify that then move out farther
Just re read your original post again .....looks like there is enough play between your Oehler and lab radar in FPS ( which did you choose , ? ) I'd start out with playing with the FPS to make it match your actual , I think almost 20fps is enough to cause the difference you are seeing
lyle2231
Well-Known Member
I'd believe what my rifle is telling me versus what software is dictating to me. FWIW I'd make up a range card for the ranges you want to shoot with the corrected come ups from each yard line. What software doesn't account for is variations in brass weight, powder formulas, primer flash, wind effects, etc.
My suspicion is the scope is off as the range and MOA increases.
What are your come-ups at those distances?
This is why range testing is important. If your load consistently shoots to those come-ups, make your load/scope specific chart and use that.
What are your come-ups at those distances?
This is why range testing is important. If your load consistently shoots to those come-ups, make your load/scope specific chart and use that.
I'd trust the Oehler
I too had this problem with a 260 and a leupold. This custom range card was my solution, as I could never get it quite right playing with the inputs.
