Rifle Scopes SN-3 Info

[Shredon]

Hi all!
Heck of a site you all have here! Some great attitudes as well.
I recently bought a SN-3 3.8-22 ERGO and what a beauty

35mm tubes, mil retical but 1/4" moa turrets. NO EREK.

I have it mounted on a 40 moa nightforce rail on a 700 rem 300WM.(it can only go on one way and it is correct)
The issue is that it bottoms out or zeros at about 450 yards. Or 3.5 Mil hold under.
So I checked the movement of the retical with the E turret from bottom to top and it drops the cross hair for 7 revolutions then nothing(no movement) for the last two spins. Picks it up on the way back down at the same spot, two turns down. The windage does this as well.
I don't know how many moa of internal adjustment this scope was built with.
I thought that even with 80 moa, a 40 moa rail would be close to zero at 100 yards or am I out to lunch

Cheers all!

SN3-2200

Paralax Control
• ERGO - Standard Option
Objective
• 58mm Low Profile Standard Option
Elevation
• U.S. #1 1/4 MOA
Standard Option
Windage
• U.S. #1 1/4 MOA Standard Option
Tube
• 35mm - 80.00
Color
• O.D. Green Type III Hard Anodizing - 160.00
Reticle
• Mil-Dot - Standard Option
Reticle Illumination
• 11 Pos Rheostat (Red) 185.00
Eye Piece Housing
• Lo Profile Housing Standard Option
Eye Piece
• Rapid Focus - Standard Option

 

[buffybuster]

Re: SN-3 Info

Does it have an EREK knob?

 

[sobrbiker883]

Re: SN-3 Info

USO's are optimum on a 20moa base.

If you have a 1/4 moa EREK, you are saying you have 157moa of up, if a 1/2moa it would be twice that. If you have USO#1 moa turrets then you have 84 moa of movement (7 revs each) so I assume you have #1 turrets....

If you went with a 20 moa base (or set your EREK up right if its an EREK) you would still have 127 to 54 moa of up.

Sounds like a slow 300WM if your 450 dope is 3.5 mils (12moa).

 

[Shredon]

Re: SN-3 Info

No EREK.
Updated OP with specs.

After mounting it on 40 MOA base and bore sighting it at 100 yards
to be on target it was required to hold the crosshair under the POI by three and a half mil on the retical.

Seems odd if the scope has 80+moa and a 40 moa base would use half of that.

 

[BobinNC]

Re: SN-3 Info

Shredon,

What did your Q.C. Procedures sheet (page 2 of your build sheet) say for total Elevation Travel and Total Windage?

Next depending on how much windage you used to zero, could have a detrimental effect on how much total elevation you have available.

 

[Shredon]

Re: SN-3 Info

Sorry, no build sheet. Can't find it

From looking on the net seems others are saying 84 moa as max travel with same spec scope. If centered, that would be 42 moa neg and pos of close to zero of rifle...no? With height over bore being in account should shoot low with 40 moa rail and being bottom of adjustment.

 

[sobrbiker883]

Re: SN-3 Info

Give USO a call, they should be able to walk you through any issues faster than we can...

Or just get a 20moa rail (that's what they are designed to use).

 

[LFOD1776]

Re: SN-3 Info

Is it possible that your 40MOA rail is mounted <span style="font-style: italic">backwards</span>?

 

[sobrbiker883]

Re: SN-3 Info

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: LFOD1776</div><div class="ubbcode-body">Is it possible that your 40MOA rail is mounted <span style="font-style: italic">backwards</span>? </div></div>

Really hard to do on a Rem receiver without it being VERY obvious.

 

[Shredon]

Re: SN-3 Info

The thicker section of the rail is at the rear of the action. I am wondering if maybe USO biases the center of the elevation throw in the SN-3 to allow more range adjustment.

 

[lazy21]

Re: SN-3 Info

what side is your windage knob on?

 

[Shredon]

Re: SN-3 Info

The windage knob is on the right hand side when mounted on rifle looking top down from a shooting stance

 

[adam1122]

Re: SN-3 Info

My Sn-3 1.8x-10x has over 65 MOA of travel....more than enought to get my .308 rounds past 1000 yards. May want to chech if you adjusted your EREK knowb (if so equipped properly) or you will loose total elevation travel.

Call USO if you are still having issues - the CSR dept. is one of the best around and will help you out.

 

[lazy21]

Re: SN-3 Info

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lazy21</div><div class="ubbcode-body">what side is your windage knob on?</div></div> <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Shredon</div><div class="ubbcode-body">The windage knob is on the right hand side when mounted on rifle looking top down from a shooting stance </div></div>

you'll be surprised what some of us seen. Why don't you post a pic of the side of the rifle so we can see the base and scope. Do you have a zero stop on it?

 

[Shredon]

Re: SN-3 Info

So, no one has a SN-3 3.8-22x 35mm tube Scope?

If you do, can you please post what your total elevation adjustment is in moa if possible.

This would be mighty helpful.

Cheers!

 

[XTR]

Re: SN-3 Info

Erectors do not always come centered. Just get a different base. In the time you putz with this SWFA could have already delivered one and you could be shooting.

I've written this little story many times, but my NF8-32 BR has 50 MOA of travel, on a 30 MOA rail it zeros 6 6 MOA from the bottom, so on a flat base it would have been zeroed at about 11 MOA above center and 36 from the bottom. I figured out that my 20MOA base was not going to work after I finished doing load development and was planning to shoot an F class match in a week. I had a 30 MOA rail sent 2nd day and was zeroed by Thursday and shot the match that weekend.

I'd bet that the USO folks know that most of the world puts their scopes on a 20 MOA rail so it gives you a 100 yd zero that is about 10 mils (34.7MOA) off of the bottom.