Which MOA rail?

[Catscratch]

Grabbed a .22 to zero in at 350m. Ran out of adjustment before I could get on target. Hitting about 3 feet low.


Do I need a 20 MOA rail? 30? Anyone know off hand?

Or just get a set of adjustable rings and fiddle with them?

 

[Wind Gypsy]

Depends how much elevation adjustment is in the scope.

How far up were you to get 3’ low? 3’ at 350 meters is about 9 MOA, so you need at least that much more up adjustment.

 

[Catscratch]

Depends how much elevation adjustment is in the scope.

How far up were you to get 3’ low? 3’ at 350 meters is about 9 MOA, so you need at least that much more up adjustment.

I don't know how much adjustment is in the scope. Old and unknown specs.

I was hitting target using the transition from thick to thin on the crosshair as a sighting point.

 

[b116757]

30 moa rail with a scope with a lot of travel 70 moa or more likely would work maybe could go with a 20 moa if your scope has enough travel but you likely need someware near 60moa total for that range personally I’d probably go with a 30moa rail.

 

[b116757]

I just realized your using Kentucky elevation and windage in your old scope so just hold a little higher over the target

 

[Wind Gypsy]

I don't know how much adjustment is in the scope. Old and unknown specs.

I was hitting target using the transition from thick to thin on the crosshair as a sighting point.

20 MOA will have 10 MOA more than needed from the sounds of things. I wouldn't go more if you ever want to shoot it at short distance too.

 

[Catscratch]

We shoot a dozen different .22's on a semi regular basis. Kentucky elevation is the norm! But I want one that's sighted in for this target. This setup won't be used for shorter distances.

 

[b116757]

Just out of curiosity why set up a 22lr to shoot 350 meters?

 

[b116757]

Go with the 30 moa rail

 

[Catscratch]

Just out of curiosity why set up a 22lr to shoot 350 meters?

There is a target there... and it's fun!

Not uncommon for one of our kids and their friends to come over and shoot off the deck. It quickly turn into "I bet you can't hit that...".


The gun I was using yesterday holds 8 per mag. Holding over and guessing I could hit once out of 8, was close enough to be fun 5 or 6 times, and seemed to have a flyer or 2. It'll just be another aspect to the fun.

 

[Catscratch]

And just to be clear... I have zero expectations that the .22 ammo I'm using will give the distance justice.

 

[b116757]

385 yds is pretty close to 350 meters with a 50 yd scope zero you need about 62 moa to hit 350meters 30 moa rail in 70moa scope gives 65 moa up and 5 moa down

30 moa rail with a 80 moa scope gives you 70 moa up and 10 moa down

 

[Catscratch]

Any chance you can plug some numbers in and figure out what the scope's MOA is? Mounted flat and on the gun (no rail), adjusted all the way up, about 3ft low at 350.

 

[Wind Gypsy]

Any chance you can plug some numbers in and figure out what the scope's MOA is? Mounted flat and on the gun (no rail), adjusted all the way up, about 3ft low at 350.

The Ballistic table he provided showed 61.2 MOA at 380 yards. 3' at that distances is roughly 9 MOA. 61-9=52 MOA. With zero inclination in the scope mount, in theory that would mean best estimate is 104 MOA total elevation adjustment. If it is "Old and unknown" and not made for dialing, i'm going to guess it doesn't actually have that much adjustment. 50-80 MOA seems pretty typical in traditional hunting style scopes.

This is some very quick and dirty math. The ballistic tables aren't tailored specifically to your rifle/ammo/atmospherics, your scope likely isn't dead center in it's adjustment range to be zeroed at 50 yards, and 3' is a pretty coarse measurement.

 

[b116757]

Best guess 100moa

 

[b116757]

No that’s not right didn’t u say u used the crosshairs post as point of aim?

 

[b116757]

I have no way to know how much added elevation that post is adding to the equation

 

[Catscratch]

Using the post puts it right on (holding over) target. Using the crosshairs it's 3 foot low. Does that make sense? Impact is on the post, 3' lower than crosshairs.

 

[Wind Gypsy]

It it has 100 MOA adjustment and you only need 9 more MOA to be centered, 20 or 30 MOA will both work for you. Scopes typically perform best near center of adjustment range so if its going to spend more time set to 350 meters, 30 MOA rail would be more optimal (pickin fly sh1t out of chili here).

 

[b116757]

If you measured the duplex post hold in inches at 100yds I could do it