Drop/MV discrepancy

[mod700]

There has to be a explanation, what reticle do you have in the shv?... like you said, maybe your point of aim is the culprit. ?
Mike

 

[Ndbowhunter]

Sfp scopes can be prone to reticle shift with change in magnification.

My old nightforce 2.5-10 was that way.

 

[HuntHarder]

Second focal plane POI only changes on BDC type reticles. The sub-tensions do not remain constant, however the actual crosshair Point of impact does not change with a change in magnification.

 

[Ndbowhunter]

I'm not ignorant.

Without the parallax knob I thought it was the case.. but nope. Reticle shift of about 1.5 Moa. Got sent back. I miss that scope a lot. The newer x42 seems even better.

Assume. Ass out of you and me. I'm guilty all the time

 

[HuntHarder]

 

[Jordan Smith]

Second focal plane POI only changes on BDC type reticles. The sub-tensions do not remain constant, however the actual crosshair Point of impact does not change with a change in magnification.

Subtensions change, yes, but POI can also shift.

 

[Unoboats]

Be sure you are using the same magnification each shot in the case of second focal plane scopes you should be at max magnification. I will make a difference.
Chip


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[Luv2hunt]

Hate to open up an old thread, but was there ever an answer to this? I am have the same problem with my 30 Nosler using a Berger 215 Hybrid Target. Velocity 2,920. Zero at 100. Using both Strelok Pro and AB, I get a calculated drop of 10.5 MOA at a verified 600 yards. But my actual drop is 9.25 MOA. 1.25 MOA lower...??? Same issue at 500.

 

[Luv2hunt]

In no real order:

1. Handloads or factory ammo?
2. Which chrono under what conditions, & how many shots to obtain “average” MV?
3. What scope & mounts?
4. How did you mount scope?
5. Dialing or holding over?
6. Grouping paper at 600 or steel?
7. Range is verified how? What is horizontal distance & what is line of sight distance?

If I’m not missing anything, seems like ‘calibrated’ MV is ~5% more than what you think your MV is. Assuming your scope tracks well, 5% could be from using a small sample size, not accounting for velocity degradation, poor chrono setup, slight error in actual range, etc.

1) Handloads - 75gr H1000
2) LabRadar - multiple sessions, varying # of shots (3-10), under different conditions
3) NightForce NP-1RR SFP .125 V & H adjustments
4) Properly
5) Dialing
6) Steel
7) At known distances at rifle range verified by Sig 2400
My confusion is that I have no issue with other guns/calibers following the same process as with 30 Nosler. So specific to this gun. Since the original OP had the same issue, I was hoping that someone had identified a setup problem. I have not tried a different scope but will probably do that next.

 

[rayporter]

one thing you can get with a labradar is get a 100yd velocity to compare to the estimated 100 yd velocity.

 

[Hiwayman92]

I’ve had this happen to me before... my rangefinder got set to meters!


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[Luv2hunt]

I did check my LabRadar. The recorded speed at 55 yards (I know, that's not 100) is exactly the same as the estimated, 2,852, on my app.

 

[Kyle Wheeler]

I’m going through the same issue currently. Starting to think it’s the rangefinder as I’ve never had this issue. Did you find any solutions?

 

[mddat]

Funny I’m having the exact same issue as the OP, 300 win mag, 215 Berger hand loads, nightforce 5-20 shv. Can’t wrap my head around what’s happening