[Gloves]

2nd time to the range with the Spikes Tactical 16"

My goal was to set the iron sights to 25 yards and the scope to 100 yards.


Maybe you can see what my problem was with the scope.

25 Yards:


100 Yards:

[MrMilspecer]

Looks like you need to go down and left. Are you out of adjustment ? Did you zero your scope at 25 or 100 ? Looks like you zero'd at 25. I would suggest to zero at 100 yards and learn to hold over at closer ranges.

[Dillinger]

Was the scope question rhetorical or did you want some help with it?

And I think Milspec meant to hold "under" at closer ranges (if zero'd at 100) as the bullet will still be on the rise out of the muzzle at closer distances to make a 100 yard zero.

[MrMilspecer]

Heres some info i found. Just from shooting a lot most my scoped rifles when zeroed at 25, 50, 100 yards i have to hold over when shooting at less than zero'd distance. The bullet rise is the cant where the scope axis and bore axis cross. Unless my brain is going...

[Dillinger]

So, with a 100 yard zero, the blue line in your graph, you would be holding lower to shoot at 50 yards, unless we are saying the same thing a different way. Looks to be about -1 on your graph.

[MrMilspecer]

Originally Posted by Dillinger

So, with a 100 yard zero, the blue line in your graph, you would be holding lower to shoot at 50 yards, unless we are saying the same thing a different way. Looks to be about -1 on your graph.

Yes you would be shooting lower at 50 with a 100 yard zero therefore you would aim high approx 1'' at 50 to compensate. You wouldnt aim lower if your already shooting under. Does that make sense?

[Gloves]

The Problem:
I zeroed at 25 yards with the scope.
Then I was shooing inexplicably high at 100 yards.

At first I thought it was the Coriolis effect.
or maybe spin drift.
Then I remembered I forgot to check the tides and could have been the pull of the moon...
Turns out it wasn’t any of those things it’s the height of the gun sights above the bore center line. (I forget the official term for this)

MrMilspecer that’s the best diagram I ever seen. It beautifully illustrates the solution to my problem. I knew I want a 0 at 100 yards. I just started it at 25. When I went to shoot 100 yards, I couldn’t see the holes in the paper. (I don’t own a spotting scope yet)

So any recommendations for an inexpensive spotting scope? It should be easily capable of seeing .223 sized holes in paper 100 yards away. =)

Thanks for the input, next time I got out (with a spotting scope) I'll be shooting bottle-cap sized holes at 100 yards.

[MrMilspecer]

Sounds like you have it figured out. The height of the scope over the bore can play tricks on people and on the ARs even open sights set up high. I almost always zero at at least 50 yards , 100 pref. As you found out a 25 yrd zero leaves shooting high at 100 the sand-rats would be safe

[Dillinger]

Originally Posted by MrMilspecer

Yes you would be shooting lower at 50 with a 100 yard zero therefore you would aim high approx 1'' at 50 to compensate. You wouldnt aim lower if your already shooting under. Does that make sense?

I must conclude that you are referring to the "X" and "Y" axis of the scope reticle when you are saying to "aim high". In effect, choosing a spot "higher" than the "X" and "Y" intercept to compensate.

If that is the case, we are saying the same thing.

The confusion is verbage. Rotate this equation 90 degrees to hit a moving target. You don't hold in front of a moving target and call it "lag".

It would appear that the OP has the information he needed though, so that is the most important thing.

[Gloves]

As far as spotting scopes go...

What do I look for? It seems most of them are 20 to 60x vairable with 50-70mm lens in the front.

What do we think about this one?
Scopes, Spotting Scopes, Waterproof Spotting Scope, By Barska at Sportsman's Guide


Looking for bang for buck here.
Thanks,