Rifle Scopes S&B total travel question

[beenjammin]

OK so my new AX came with a 0 moa rail ( advertised as a 20, but I should have known better) since my spuhr mount has 0 moa also, i am now worried I wont make it to a grand. I read the 5-25 has 27 mils of total travel. If Im thinking correctly that should give me close to 12- 13 mils if I zero it at 100 ( I hope). MY question is once you take a scope to the end of its travel range, how reliable are the adjustments when the erector is being pushed to its limits?

Anyone have trouble getting 11 mils out of a PMII mil on a zero moa base?


thanks

 

[Kiba]

The PMII typically has about 29 mils of actual erector travel. The DT knob will only allow a max of 26 mils of rotation from zero provided the scope doesn't run out of erector travel first (that will depend on the cant of the base and the rifle.)

I haven't seen any tracking issues running my PMII's up to the extremes of travel doing box testing but there is some vignetting of the image that begins about 8 mils from the extremes of the erector travel and the vignetting increases the closer you dial towards the erector limits. This is visible as a darkened "crescent slice" at the top or bottom of the image depending on which end of the erector limit you are approaching; the vignetting at the top of the image that occurs near the bottom limits of the elevation travel seems to be more noticeable.

With a 0 MOA base and a 100Y zero I'd guess you'll have somewhere around 14 mils or so of elevation travel left. While that should work I'd take the $50-60 hit and sell your 0MOA Spuhr and pick up a 30MOA or 44.4MOA Spuhr to replace it.

 

[Jerry R]

I have seen as much as 34 MRAD of total internal travel in some 5-25s but most typically have between 30-32. On a flat rail you should get somewhere around 13-14 of travel, several factors being dependent of course.

In my experience I have not seen a deviation of adjustment on the extreme edges of the range versus the adjustment of a centrally located erector on a PMII.

 

[NevadaZielmeister]

I have seen as much as 34 MRAD of total internal travel in some 5-25s but most typically have between 30-32. On a flat rail you should get somewhere around 13-14 of travel, several factors being dependent of course.

In my experience I have not seen a deviation of adjustment on the extreme edges of the range versus the adjustment of a centrally located erector on a PMII.

Jerry,

Thank you so much for assisting people on these forums.

I have a question. I purchased a PMII 5-25x56 and will be mounting this onto a 20MOA rail. What kind of internal adjustment range will I have then while using this for .308 long range shooting out to 900 meters? Will I have an issue with zeroing at 100 meters? Based on my FDAC, the mill adjustment will be about 9 out to 900 meters, so I should have plenty, even with a single turn, correct?

 

[Jerry R]

Most of mine are on 30 MOA rails but one is on a 20 and I'm getting 20.6 mil with that set up. I only need 18.7 to get a 208 to a mile so I'm fine with that.
Obtaining a 100 yd zero will be no issue at all.