Rifle Scopes Can mount height impact elevation adjustment?

[BoilerUP]

I recently purchased a Bushnell 4200 Tactical 6-24x50 FFP in the Classifieds section, hoping to get my first "quality" (at my price point) long-range optic. Knowing this scope lacks a large amount of elevation adjustment, I bought a Weaver 20MOA extended slot base and picked up a pair of Burris Xtreme Tactical 30mm medium height rings from the SH classifieds. All of this is mounted on a Savage 10FP, with a Criterion .260 Rem varmint contour barrel. There is approx. 0.4" between the barrel and the lowest point of the scope objective.

I finally got the rifle to the range yesterday, and with my preferred load (123gr AMax @ 3000fps) zeroed at 100yd, I only have 7.1mil of up adjustment left...even with the 20MOA base.

According to JBM, ~6.5mil will get this load to 900yd, and I only currently have 600yd to shoot, so its a moot point anyway....just curious to see if I might be able to gain a little more elevation by switching to low rings, or if I should look at a 30MOA base or maybe Signature Zee rings.

I did a search and nothing jumped out at me.

Thanks

 

[TiroFijo]

Re: Can mount height impact elevation adjustment?

The higher the scope, the less elevation correction you need at long ranges...

But the difference is VERY small, for exmaple if you use a 100 yds baseline zero and switch to 0.4" higher rings, the difference at 1000 yds is only 3.6". This is, you would need about 0.34 MOA less to correct the vertical point of impact at 1000 yds.