Thread: Shimming a scope

I dropped an Element Optics Helix on my .223 to shoot some groups. I wanted to test a few loads for accuracy.
It was previously on my .308. After about 20 rds I finally figured out it was about a foot low and a foot right at 25m.

Its so far out I don't see the point of putting it on that rifle but it got me thinking. If I was to zero it, what would be the best way?
If it was a standard 3-9 hunting scope I would set it and forget it.
But because its dialable, I'm just going to use up all the adjustment within the scope to get on paper at 100m.

One foot at 25m is four feet at 100m.
Four feet is 122cm and one click is one cm, so to get on target is 122 clicks.
The adjustment range is 18.9 MRAD, there's not a lot left over to dial with.

I figure the only way to make it work is to shim the scope in the ring.
The shim should be in the forward ring in the top right quadrant. That should center the scope more.

I'm pretty rusty at shooting long range so I may have missed something obvious, I am curious to hear what the pros think