Schmidt & Bender Ultra Short 3-20 - Need to go below zero stop to sight rifle

[okeefe]

I have searched this forum and googled this and can’t find the answer. I am hoping that some of the hide members might have the answer.

My son just purchased a Ruger Precision Rifle (caliber 300 PRC) he didn’t have a scope yet so I mounted my Schmidt & Bender 3-20 Ultra Short on it to just to get some shots down range. While sighting it I was 16 inches high at 25 yards. The elevation turret was at ”0” so there is not where else to go. The Rifle has a 30 MOA rail and the Spuhr mount is 20 MOA.

1) Can the Scope elevation be set to less than factory zero?

2) If the scope elevation can be set to less than factory zero, how do I accomplish this?

3) I am assuming that I lose elevation range if I go less than zero?

4) Is there any other way to correct this issue?

Pictures of rifle and scope attached for reference. Thank you in advance for any help

 

[Wyfox]

Push the lock collar down and loosen the 2 screws on the turret some.
Unlock turret and turn to 5 or however many clicks you need, then lock turret and snug 2 allen screws up.
Unlock turret and sight rifle in.
Once sighted in do the same thing except after you loosen move turret to 0 and retighten.

 

[pucker]

^^ this. With the extra cant your combo has.... think of it as getting back some of your scope’s internal elevation adjustment. (a good thing)

 

[okeefe]

Push the lock collar down and loosen the 2 screws on the turret some.
Unlock turret and turn to 5 or however many clicks you need, then lock turret and snug 2 allen screws up.
Unlock turret and sight rifle in.
Once sighted in do the same thing except after you loosen move turret to 0 and retighten.

Thank you for the reply. And not that I don’t believe you, but am really struggling with this whole concept. wouldn’t that just raise the point of impact By 5 and my first shot would start off even higher?

 

[pucker]

The opposite... it’ll lower it.

You’re unlocking (via the screws) the turret, THEN dialing up x mils, tighten the screws, and when you turn the turret back to zero, your POI will be x mils lower.

 

[okeefe]

The opposite... it’ll lower it.

You’re unlocking (via the screws) the turret, THEN dialing up x mils, tighten the screws, and when you turn the turret back to zero, your POI will be x mils lower.

Ahhhh. Now I get it!

 

[Huskydriver]

Thank you for the reply. And not that I don’t believe you, but am really struggling with this whole concept. wouldn’t that just raise the point of impact By 5 and my first shot would start off even higher?

No because you disengaged the turret when you loosened the screws all your doing is moving the outer turret and zero stop. Do exactly what he said and you will be fine.

You guys shooting at the Lions club?

 

[ma smith]

The Rifle has a 30 MOA rail and the Spuhr mount is 20 MOA.

15mils elevation in that base combo is a ton

 

[pucker]

15mils elevation in that base combo is a ton

Depending on turret, it’s likely half or less what the scope has available. I.e., not an issue and gives him max useable elevation.

 

[ma smith]

Depending on turret, it’s likely half or less what the scope has available. I.e., not an issue and gives him max useable elevation.

In any event, if one wonders why the scope is off >48inches at 100 yards, its because of the 50MOA base.

 

[pucker]

He said 16” at 25y. Not sure where 48” is you mention.

More likely the reason his POI is high... is he was already zero’d on a different setup using less cant.

You keep implying it’s too much. It’s not.

 

[ma smith]

He said 16” at 25y. Not sure where 48” is you mention.

Do you even MOA? (just kidding)

In any event, if one wonders why the scope is off >48inches at 100 yards, its because of the 50MOA base.

If you run the math, you get a large number at 100yd
follows from the smaller number at 25yds.

16in @ 25yd
=>64in @100 yds

So, this is 5 feet 4 inches error @ 100yds
estimate that 4 feet is attributable to the base
(4ft=>~48inch vs 50MOA=>~50in@100yds)

{Apologies for the rounding}

 

[pucker]

Do you even MOA? (just kidding)

If you run the math, you get a large number at 100yd
follows from the smaller number at 25yds.

16in @ 25yd
=>64in @100 yds

So, this is 5 feet 4 inches error @ 100yds
estimate that 4 feet is attributable to the base
(4ft=>~48inch vs 50MOA=>~50in@100yds)

{Apologies for the rounding}

Ah, missed the 100y extrapolation.

If really 16” (~18 mils) high at 25y, the previous zero must not have left much elevation adjustment. (Less than half what should have available)

And what’s MOA?

 

[okeefe]

No because you disengaged the turret when you loosened the screws all your doing is moving the outer turret and zero stop. Do exactly what he said and you will be fine.

You guys shooting at the Lions club?

We haven’t gone up there yet. Been in Utah about 1 year. I’m a California refuge

 

[okeefe]

Thanks everyone for the help. This scope was on my LMT MWS and zeroed for the rifle. This likely exacerbated the problem. Since I didn’t save the target I am guessing it was 16” high at 25 yards but talking to my son he thinks it was more like 12”