Zeroed at 100 but shouts 4” high at 200

[AkleyFan]

Have you checked for parallax? Moving your head up/down/all-around, like the hokie-pokie but different Adjust it if possible.

Probably be best to wait for the new scope to get mounted, sighted in and run your 200 yard test again. That 338 Lapua is not going to be kind to your scope's internals unless it's braked 100% of the time.

 

[Sdvldog1371]

My question is, is this a Second Focal Plane scope? If so, are you changing magnification when shooting 200 yds? SFP scopes should be zeroed at a certain point in their magnification range and stay there when shooting longer distances. The cheaper the SFP, the more of a difference it seems to make. A nice Swarovski might be off by a little bit at 200 when shooting with different magnification, a cheap nikon or burris etc...might be off quite a bit. I learned that the hard way.

 

[bluedog69]

A lot of guys around short range country will sight a gun in according to box data. She is exactly 1.75" high at 100. Then when they shoot 200 it is dang why am I 4" off?

If I want a 3" maximum point blank range with factory federal 7mm Mag bullets their ballistics chart said 323 yards should be 3" low. So I could have sighted it to the correct 100 yard height but who knows where it would hit at 323. Now if I sighted it 3" low at 323 it can't help but be on its correct flight path as it gets closer to the gun.
Never trust "it is on at 100".

 

[tbroz]

Yes it is a SFP. I set it at 100 when shouting that then move it to 200 when shouting 200

 

[Ckgworks]

If it was me, I'd sight it in at 200 to where you feel your ballistics say it should be hitting. Then shoot at 100 and see what happens. Seems like that should tell you something.....?

 

[Sdvldog1371]

Yes it is a SFP. I set it at 100 when shouting that then move it to 200 when shouting 200

figure out what magnification you're supposed to be on according to the manufacturer, zero at 100. Stay at that magnification, but change parallax to around 200 and shoot it at 200, then report back. If you are adjusting parallax to be clear at a given distance you have to be very sure your diopter is properly adjusted first.

 

[GSRetrievers]

figure out what magnification you're supposed to be on according to the manufacturer, zero at 100. Stay at that magnification, but change parallax to around 200 and shoot it at 200, then report back. If you are adjusting parallax to be clear at a given distance you have to be very sure your diopter is properly adjusted first.

Why have a variable power optic? The reticle is set for a certain magnification, but since he isn't using holdover, why would it make a difference? I've used sfp from 100 to over 2k and this is news to me.

 

[Maol]

So...where is his "second zero" if the "First zero" is at 100....

His "first zero" is actually at about 90 yards, his "second zero" is at about 110 yards. 200 SHOULD be about 2.5" low.

The further out you go for the "second zero", the "first zero" moves CLOSER to the shooter.

View attachment 643045
View attachment 643046


Unless....the OP is shooting something like this...then maybe.

View attachment 643063

If his 100 yard Zero isn't his first zero it is his second zero. There are only two.

So if it is his second then he can't be 4 inches high at 200 yards. So it has to be his first zero.

We need all of the data to do ballistics calcs.

But if he is 2 inches low at the line and zero at 100 his second zero can't be 110 yards.

 

[Earnie57]

I have a 338 lapua zeroed at 100. Shot three different loads and with 1/2". Then I go to 200 and it shots 4" high and about an inch to the left. I go back to 100 and it's perfect again. Used a bench to shot from on both 100 and 200. Is there something wrong with the scope. This should be shooting 2 to 3 inch low not high.

If you're zero at 100, you should be 3" low at 200 with a 250 SMK at 2,900 fps.

 

[tbroz]

If you're zero at 100, you should be 3" low at 200 with a 250 SMK at 2,900 fps.

I agree from everything I know about these loads I should be anywhere from 2.5" to 3.5 " low. This is why I'm confused and believe the scope is not working correctly

 

[GSRetrievers]

I agree from everything I know about these loads I should be anywhere from 2.5" to 3.5 " low. This is why I'm confused and believe the scope is not working correctly

What did you change on the optic from 100-200? If nothing, why do you think it isn't working correctly?

 

[tbroz]

What did you change on the optic from 100-200? If nothing, why do you think it isn't working correctly?

Turned the front from to 200. The focus I believe it's called something else like the parallax . The newer scopes have it on the opposite side of the windage.

 

[Maol]

I agree from everything I know about these loads I should be anywhere from 2.5" to 3.5 " low. This is why I'm confused and believe the scope is not working correctly

Should be about 3-3.5 inches low as every body says.

Since it is obviously about 6- 7 inches higher than the predicted POI. Which is double the expected POI, I think maybe your rings or rail are installed on the rifle backwards.

 

[tbroz]

I'll take a mic and check but I thought both the same