Thread: Moa help

Hi I just want some help to check if I'm doing this right, I sighted in a new scope and zeroed it at 200yds bullet dropped 10inch at 300, 32inch at 400, and 62inch at 500yds, now here is my prob, 500yds is 5 moa, 62 divide by 5 is 12 so I should adjust 12 moa is this correct? Because when I do this I was shooting well over the target I had to adjust back to 9 moa to hit the target and could not make sense of it, calibre is 308 scope is leupold mark 4 LR/T 8-25, any help would be appreciated

If it drops 5moa dont you rise it 5moa?

I actually have no idea but if something dropped 5moa I'd think you have to rise the sight 5moa to bring it back to zero.

I'll go away now and leave it for someone in the know

You now know its 9 MOA to hit a target at 500yds so whats the problem? apart from being like me and not understanding the math of it all I just rely on shooter and validation.There will be some number crunching wiz along shortly hold tight.

That's a lot of drop. I would be rechecking the 200yd zero. Even at 2600fps .308win should low fiftys for drop at 500yd with 200yd zero.

What load are you using? Have you choreographed it?

Yes 1moa = roughly 5 inches at 500 yards, so *if* you have 62 inches of drop it *should* be about 12.5moa of up to hit at 500.

Balkie, the easiest way to do that calc is to ask : what is 1 MOA at this distance ?

So at 500yds, 1 MOA is roughly 5 inches.

If your correction is 62 inches, then divide 62 by 5 = 12.4

Did you get the 62 inches from a balistics chart /program, or was it an actual measurement based on shooting 500yds ?

Several things can be happening:

Your range estimate might be incorrect
Your input variables to the ballistics calc might be incorrect
The click adjustments on your scope might be inaccurate

I did recheck the zero again before I finished, I thought it was a fair bit of drop also, rifle is suppressed but removed that and was still shooting the same groups, was shooting with federal fusion 180gr

A MOA is not exactly One inch at 100y,also your scope may not adjust exactly 1MOA for one MOA adjustment.
As neckshot said now you know its not a problem.
And that is a hell of a lot of drop! running 208s-215s? I get a muzzle vel around 2500fps

Originally Posted by superbalkie

I did recheck the zero again before I finished, I thought it was a fair bit of drop also, rifle is suppressed but removed that and was still shooting the same groups, was shooting with federal fusion 180gr

Did some one cut it in half before fitting the suppressor?

Originally Posted by gimp

Have you choreographed it?

I hope that was an autocorrect mistake!

I had a range finder so distance was good and the 62inch was from testing not from chart, I would hope the scope is set right it not exactly a cheap and nasty scope

Originally Posted by Spudattack

I hope that was an autocorrect mistake!

haha yes

Are you using the drop chart on the side of the ammo packet or have you calculated the 62"? Seems an awful lot and probably where the error is coming in.

2750fps is a rough guess if you came up 9 moa at 500 yds for 180gn projectile

Rifle is steyr scout which is fairly short barrel may explain a little more drop