Correcting scope dialing inaccuracy

[Barbourcreek]

Try to do a 100 yard tall target.
It's the only way to fix the scope percentage

 

[A A Ron]

Yes

I did a tall target test with this scope. At 100 yards 10 mils should be 36" of elevation. My scope gives 37.19" when I dial 10 mils up. At least a 3% error. It returns and dials constantly. Just consistently with an error.

I don't have a hundred yard tape. Only two laser range finders. So that may cause inaccuracies. That's what I meant about not being able to do a tall target test, to the level of accuracy you described.

 

[A A Ron]

Edit - dials consistently

 

[Barbourcreek]

Here you go

 

[Bravo 4]

What's Leupold's acceptable dialing error before they'll correct it under their quite generous warranty?

In other words, I'd call Leupold and tell them that the optic is giving a 3% error and is causing problems at long range.

I would talk to Leupold about it. 3% seems like a lot.

Definitely call them and post their response, I'd like to see if their standards have gotten better. In the not too distant past I had a FFP MK4 ERT (not a cheap scope) that was 10% off on elevation adjustment. Sent it to them and they sent it back with a clean bill of health, no problems found. They have told me that a 3 degree cant of the reticle inside the scope is acceptable…no it's not!
A 3% discrepancy with turret adjustments is not as uncommon as you think and is usable as long as it is repeatable and consistent over the (at least most of) full range of adjustment. Sometimes things can get squirrely on the fringes, especially if the windage isn't centered.

 

[A A Ron]

Update

This afternoon I made it out to shoot. I was very pleased with the results. After inputting all environmentals, and using a .103 elevation correction, and using trued BC the target didn't lie. Dialed center line hits at 390, 750, 950, and 1134.

I did email Leupold customer service just to see. I can live with the results.

 

[kgarrett]

Glad to hear you're on target! As long as the 'clicks' are consistent, you should continue to have great results!

 

[Barbourcreek]

Update

This afternoon I made it out to shoot. I was very pleased with the results. After inputting all environmentals, and using a .103 elevation correction, and using trued BC the target didn't lie. Dialed center line hits at 390, 750, 950, and 1134.

I did email Leupold customer service just to see. I can live with the results.

Did you plug in the number I gave you?

 

[A A Ron]

Not exactly, but the math should be the same. Strelock doesn't look the same and rounds up the ten thousand digit. I'll attach the screen shot where I made the correction.

 

[Culpeper]

Update

This afternoon I made it out to shoot. I was very pleased with the results. After inputting all environmentals, and using a .103 elevation correction, and using trued BC the target didn't lie. Dialed center line hits at 390, 750, 950, and 1134.

I did email Leupold customer service just to see. I can live with the results.

Are you using multiple BCs in Strelok or one single BC?

 

[A A Ron]

No

 

[A A Ron]

A single trued bc, because I used the Labradar for velocity.

 

[Culpeper]

Did you true your bc at each distance. Strelok allows you to do that on the target as well as adjust your scope click value if needed. This is why Strelok and other apps have a banded BC option aka drag curves. Your starting point is a good avg MV in any case.

 

[Culpeper]

Yes

I did a tall target test with this scope. At 100 yards 10 mils should be 36" of elevation. My scope gives 37.19" when I dial 10 mils up. At least a 3% error. It returns and dials constantly. Just consistently with an error.

I don't have a hundred yard tape. Only two laser range finders. So that may cause inaccuracies. That's what I meant about not being able to do a tall target test, to the level of accuracy you described.

You need exactly 100 yards and the scope needs to be stabilized. There is no shooting involved. Your only estimating here and a chunk of 3% can certainly put it in the noise.