Rifle Scopes Help with calibrated elevation on USO

[maccrazy2]

Hello all. I just picked up a SN-3 tpal USO scope that came with a turret for .308 and one for 300wm. The 300 is marked the .308 is not. I called USO and they looked up the scope and said it was built with a generic .308 elevation turret. I asked what weight and velocity it was designed for and the lady said it is just generic. She thought it may be a 168gr but did not know for sure. The scope is a 1/2MOA per click. The markings for yardages are as follows in clicks/moa
100-0-0
200-4- 2moa
300-6- 3moa,-----5moa from zero
400-6- 3moa,-----8
500-7- 3.5moa,---11.5
600-8- 4moa,-----15.5
700-9- 4.5moa,---20
800-11- 5.5moa,--25.5
900-11- 5.5moa,--31
1000-13- 6.5moa,-37.5
I will play with my balistics calculator tonight and see what comes up close. I just wanted to see if this is a common knob or if anyone knows them off the top of their head. I am in denver and do most of my shooting at 6000-1000ft elevation so I don't know how close I will be to the marks on the turret. Any info is appreciated.

 

[KNIGHT11B4]

Re: Help with calibrated elevation on USO

Could be the same one they use for the SSDS.

Have you considered just having USO run you off another knob without the BDC. They can make it pretty much anyway you want it and it is very inexpensive.

 

[sobrbiker883]

Re: Help with calibrated elevation on USO

Are those clicks between yardages, and added to the previous number?


As in:
Yds-Total Clicks-MOA
100-0-0
200-4-2
300-10-5.5
400-16-8
500-23-11.5
600-31-16.5
700-40-20
800-51-25.5
900-62-31
1000-75-37.5

which is close to 175 M118LR dope......and is how my USO Scout Sniper Day Scope was setup.


If not, its marked for a laser, because nothing shoulder mounted and powder propelled makes it to 1000 with 6 minutes....

A picture would help.

 

[maccrazy2]

Re: Help with calibrated elevation on USO

Yes the clicks are just listed from each 100yd marking. I likely will end up with another knob but I will have to live with this one for a little while as I am tapped out.

 

[JBW3]

Re: Help with calibrated elevation on USO

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">If not, its marked for a laser, because nothing shoulder mounted and powder propelled makes it to 1000 with 6 minutes....

</div></div>

Was just thinking the same thing!

It is probably for 168 at 2650 at 70F.
John III

 

[sobrbiker883]

Re: Help with calibrated elevation on USO

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: maccrazy2</div><div class="ubbcode-body">Yes the clicks are just listed from each 100yd marking. I likely will end up with another knob but I will have to live with this one for a little while as I am tapped out. </div></div>

Shoot it at known distances with your preferred load and write down your dope. Make a small chart and tape it to your stock or laminate it and hang it off your rings or scope. Just note the difference between your load and the what's marked.
ie- 500=5-2 if your load gets to 500 with 10.5 moa, etc......

A regular 1/2 min turret wouldn't set you back too much from USO.

John-Did you get my email?

 

[maccrazy2]

Re: Help with calibrated elevation on USO

Thanks guys. I will work up my own dope on my next outing. I have alot of 168s ready to go. I am really looking for info on what the knob is for so I can sell it after I replace it to someone who can use it as marked, if possible.

 

[sobrbiker883]

Re: Help with calibrated elevation on USO

168 @ 2650 @ 70F is pretty much Federal Gold Medal Match.

 

[maccrazy2]

Re: Help with calibrated elevation on USO

Ok, I made it home and ran some numbers thru dop3.com and the 168 is very close on most of the range intervals. I bumped it up to 6000ft elevation and 30% humidity and I will have to make a dope chart but that was expected. Thanks guys.

 

[JBW3]

Re: Help with calibrated elevation on USO

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">John-Did you get my email?
</div></div>

No, fire another off. [email protected]
John III