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Advanced Marksmanship AI AW 308 factory set up shooting sierra 175smk - running out of elevation at 1k

edd1e22

HNIC
Full Member
Minuteman
Jul 1, 2002
224
107
44
San Jose
I have a stock setup with AI ring/base and a 3-12x50 PMII CW DT which has 56moa of adjustment. I haven't really been shooting in close to a decade and forgot how to use my equipment.

Today, I went out to a 1k range and ran out of elevation when my elevation knob hit a hard stop at 55moa which doesn't make any sense. As I type this, I realize my zero at 200yds was already at 26moa. I asked a few of the more experience shooters and they told me I need a 20moa base which I'm almost certain the stock AI integral base/rings had built in.

I feel like I'm screwing up something basic as I'm supposed to have 56moa of adjustment and only need 37moa yet I'm topping out.

Did I set the zero stop on the elevation turrent wrong or do I really need to get new mount/rings?
 
What is the muzzle velocity are your 175 smk rounds? Typical factory match loads for that bullet are about 2600 feet per second which would put the drop around 38 moa at 1000yds.
 
I am guessing by AI ring/base you mean the AI one piece scope mounts.
First of all, do not assume because their mounts can provide anywhere from 0 to 45 MOA built in.
Yours should have a number that corresponds to the ring size, height and MOA/Mil angle.
If you mistakenly installed the mount backwards this could cause the problem you are describing.
 
The scope mount markings will be on the top of the base, under the scope housing. They should read "34 AAA BB" Where 34 is the ring diameter, AAA will be the height of the mount/ring to center of scope tube and BB will be the inclination.
 
Sorry I didn't answer the original question. My mount is correctly installed; screws are on the left. I looked at the top of my mount and it appears to not have any markings. The gap is pretty narrow so it's hard to get a clear view.

I did unscrew the heads to the elevation cap and was able to reset the elevation knob. I then ran it up and it hit right about 50" for 50moa of adjustment @ 100yds.

Thanks to all for the help!
 
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