Rifle Scopes Newbie help SCOPE ZERO ISSUES

[HkPlinker]

OK,
I have a 308 SASS with a flat top receiver I plan on shooting 100-300 yards. i am trying to zero at 100 yds. The scope would not fit directly on the rifle rail, so I bought a SWAN long rail mount to raise the gap and used V-TAC 30mm rings to mount a US Optics scope.
I have never ran into this, so please forgive me. The scope is shooting about 12-14 inches high at 100 yards, but the scope elevation adjustment is bottomed out and i have no more "travel" to lower the point of impact.

I'm assuming my A.R.M.S. mount is a 20MOA or I need a 20MOA ??

I'm at a loss, thanks in advance.

 

[uskgxh11]

Re: Newbie help SCOPE ZERO ISSUES

Shim the front. Post a pic of what you have for a better answer.

 

[Rob01]

Re: Newbie help SCOPE ZERO ISSUES

What knob do you have? If it's the EREK are you using the center allen to zero or the knob itself?

Some info from their site which might help
http://www.usoptics.com/instructions

 

[lazy21]

Re: Newbie help SCOPE ZERO ISSUES

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Rob01</div><div class="ubbcode-body">What knob do you have? If it's the EREK are you using the center allen to zero or the knob itself?

Some info from their site which might help
http://www.usoptics.com/instructions</div></div>

What he said

 

[jaydoski]

Re: Newbie help SCOPE ZERO ISSUES

Well my 1.8-10x USO on a 20 MOA base bottom'd out and still couldn't reach a 100 yard zero either so you might have a 20 moa cant in there somewhere.

 

[UNCIVILIZED]

Re: Newbie help SCOPE ZERO ISSUES

You can always turn the mount 180 degrees, boresight, & then send a few down range.

 

[HkPlinker]

Re: Newbie help SCOPE ZERO ISSUES

I have the ARMS 35QD mount. I can not find anywhere is it is 20MOA. I guess I have to shim the front ring, but first I will go through the zeroing steps as described on the US Optics site.

Thanks for the direction. I will post follow up

 

[Rob01]

Re: Newbie help SCOPE ZERO ISSUES

You shouldn't need to shim anything with that scope and a 20 MOA base. You should be able zero that just fine at 100 yards. If it still doesn't zero you either had to use a lot of windage and limited your internal travel, the directions werent followed correctly or there is a problem and yo should call US Optics.

 

[HkPlinker]

Re: Newbie help SCOPE ZERO ISSUES

Well, after further trouble shooting, I noticed the rail mount that was bolted into the ASRMS QD mount was canted rearward. It appears the 20MOA rail was installed backwards from ARMS.

Jeeze . . .