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.

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

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?

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.

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 superbalkie

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

So you still havent told us if you have measured the speed at all?

Moa help?,

Sorry, too late, moaris ate them all already.

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

Any kind of bullet drop compensation that's based on guess work is hopeless.
all inputs need to be correct in order for you to get any kind of workable drop chart.
Knowing how fast the given projectiles are going is very important.

If you can't get hold of a chrono re-write your chart in the field based on actual drop and Click value required at given ranges.

This will take some considerable time and precision shooting but it does take away the effect of any variables you may have in your set up.

Cheers.

If indeed your drop is measured and your zero is 200 you should get something like this , not perfect match but i didnt have time to tweak , but it would seem a very low velocity .



If then you adjust your scope and find that it only takes 9 MOA to reach your target i would then look at the scope adjustments , they cant be tracking 1/4MOA . It can be corrected in a ballistic program to match your scopes actual tracking adustments but i would suggest more varified testing first.

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.

Originally Posted by gimp

Have you choreographed it?

I hope that was an autocorrect mistake!