Rifle Scopes Reversing a Spuhr Mount

[Devlin]

Hey Gang,

This may be a really dumb question but it's nagging me so thought I would ask here. I have two rifles one is a Tikka (308) with 0 MOA rail that has a 34mm 20 MOA Spuhr sitting on it with a S&B PMII. The second rifle is an Impact 737 (6.5 Creed) with 20 MOA built into the rail, it has a 0 MOA 30mm Spuhr sitting on it with a Nightforce NX8.

Rifle 1 - Tikka TAC A1 308 with 0 MOA rail , S&B PMII 34mm in a 20 MOA Spuhr mount
Rifle 2 - Impact 737 6.5 Creed with built in 20 MOA rail, Nightforce NX8 30mm in a 0 MOA Spuhr mount

I prefer the PMII between the two scopes and am thinking about putting on the second rifle with the built in 20 MOA rail, I don't want to run it with 40 MOA just by swapping the scopes between the two guns and am concerned about having the turret run out of center (maybe its not as big a deal as I think?)

What I'm wondering about is could I take the PMII and reverse/flip it around so it mounts in a reversed format and put it on top of the Impact 737 with the effect of running in a 0 MOA setup by reversing the mount. Is this a really dumb idea or would it work? Any downsides you can think of by doing this?

 

[PinesAndProjectiles]

Buy a 20 MOA rail for the Tikka.

 

[Devlin]

Buy a 20 MOA rail for the Tikka.

Sorry to be clear the Tikka I'm not so concerned about it's whether reversing the 20 MOA mount and mounting it backwards on the Impact action would effectively cancel things out to 0 MOA and allow me to run the S&B PMII without a whole bunch of cant in the setup.

 

[PinesAndProjectiles]

I get what you're saying, but if you put a 20 MOA rail on the Tikka, you could swap the S&B between the two rifles without having to remove the scope from the rings/mount.

It would be less dicking around.

Unless you're going to run the scope backwards.....

What you are asking is doable, though.

I prefer to leave my scope in the rings because I know it's level. Having to 180 the scope would require you level everything again.

 

[WildBill3/75]

Yes it can be done.
But why would one ever do such a thing? 20moa isn't a massive amount of cant and almost all modern scopes have no issues with 20moa of cant and adjustment.

I run 20moa on just about everything I own.

 

[charnicus]

I bet you could find someone to trade you mounts.

 

[Devlin]

I bet you could find someone to trade you mounts.

Yeah thinking about doing just that, I'm up in Canada so not sure about dealing with shipping back and forth across the border but we've got some other gun forums here that I may try to do that.

 

[charnicus]

Yeah I wouldn’t know anything about that... Or flip it in the meantime and post in the PX once you hit the magic number. I’m certain there are some more Canadians around these parts.

 

[beetroot]

I can't see why it wouldn't work but you'll only know for sure if you try it.
I'd try using it the normal way and seeing if you run out of elevation, if you do try it backwards.

 

[Steel+Killer]

You will not bottom out with the PMII running a 40 MOA set up I am running a 50 MOA setup with a PMII and I can still achieve a 100yd zero. When done shooting you should not leave the scope on "0" you will want to turn the elevation up past the second rev so the scope is not stored with the erector close to being bottomed out.

 

[n00g7]

As already noted, there’s more than enough elevation in the PMII for 40 MOA cant.

 

[918v]

Just get a 20MOA mount and be normal like everyone else.

 

[shnipöw]

You will not bottom out with the PMII running a 40 MOA set up I am running a 50 MOA setup with a PMII and I can still achieve a 100yd zero. When done shooting you should not leave the scope on "0" you will want to turn the elevation up past the second rev so the scope is not stored with the erector close to being bottomed out.

Had no idea about potential damage by storing it with erector close to being bottomed out... Good to know. May I please ask something though. I run an 0MOA base, hence I had to move upp the zero quite a bit and thereby don't have more than just 2 mils on the second revolution. In other words can only turn it a tiny bit past second rev.. would this affect the scope in long term?

Or would it be far from the erector all the time now since I moved up the zero quite a bit?

Sorry if I am coming of as confused, but it's just because I am Also a newbie with a tikka and s&b scope, lol!

 

[srt-4_uk]

Had no idea about potential damage by storing it with erector close to being bottomed out.

Because there isn't.

 

[Steel+Killer]

Had no idea about potential damage by storing it with erector close to being bottomed out... Good to know.

Don't take my word on it. This advice came directly from @Jerry R a much respected guy who runs the S&B service center here in the states.

Here is a link to the thread......https://www.snipershide.com/shootin...b-5-25pm-ii-it-happened.6930690/#post-7591172

It takes all of three seconds to turn the elevation turret up past the second rev and I sleep better at night.......LOL

 

[beetroot]

Because there isn't.

I guess it runs along the same lines of the myth storing magazines loaded wears out the springs.

I always thought it was repetition that wore out springs not being kept under constant tension.
Otherwise your trucks suspension would be toast from just sitting in your driveway for 5-10 years.

 

[Steel+Killer]

I guess it runs along the same lines of the myth storing magazines loaded wears out the springs.

Say what you want, but any magazine I have kept fully loaded for a long period of time the last couple rounds don't have the same pressure pushing them up the way they did when the magazine was new.

Otherwise your trucks suspension would be toast from just sitting in your driveway for 5-10 years.

Bad analogy you're not even comparing the same situation correctly. Your truck sitting in your driveway with no load in it does not have your suspension bottomed out/compressed. Now imagine you had a really heavy load in the back of the truck that had the suspension almost completely bottomed out sitting in your driveway for 5-10 years. You think if you unloaded the truck after 5-10 years it would go back to sitting like normal.......Me I think your suspension would be toast.

I am not trying to beat a dead horse or derail the thread you guys do what you want with your 4K plus rifle scopes I know what I am going to do with mine.

 

[WildBill3/75]

Off topic from the original post.

For those that don't know how an erector works.

What makes Swarovski better???

It's not just the glass it's also the mechanics. This is an illustration of a reverse...

www.opticstalk.com

The Purpose of the Erector Tube and the Erector Spring in a Riflescope - Optics Trade Blog

The erector spring inside the riflescope presses the erector tube against the bottom parts of the windage and elevation turrets, fixing it in place.

www.google.com

I've seen all sorts of shit about springs in firearms over the years and about compression. I've tested many real world myself.
Lock a Glock slide back and leave it that way for a few months. I guarantee that recoil spring will be severely weakened.

Same thing with magazine springs but generally to a lesser extent. Load some ar mags up to full capacity and leave them that way for 6+months and see how they are. They still work but depending on quality and construction effects how much they are weakened.

Springs are a consumable and have a life cycle. Best to take care of them.