Mounting a scope with Burris Signature rings.

[Grey Kiwi]

I'm setting up my CZ457 for 25 yard benchrest (I don't intend to try out for the Olympics...just having as much fun as I can for what I can afford).
Using a Sightron Sll 36x42 scope, and Burris Signature rings (with those plastic inserts).
Will mount directly to the CZ 11mm dovetail.
The scope is said to be delivered 'optically centred', and it would be nice to keep it close to that.
I can see that I will need to cant the scope downwards a tad towards the target.
I either lower the front of the scope or raise the rear of the scope. Centre of bore to centre line of scope about 1.5"
I guess there is a way to work out what plastic insert I need, rather than just grab a few and see what works.
Not a great deal of choice here in NZ, and the Burris plastic inserts are few and far between.
At such a close range I'm figuring 0.010 inserts at least.
But...maybe one of you has already done this and can advise me?
I don't want to use a canted rail, because a rail just introduces another attachment point to the whole deal.
Plus, of course, actually finding a canted rail that I can buy and get into NZ (the US folks won't sell them out of US).
So, it's got to be using the dovetails for scope/rings attachment.
Thanks.

 

[Grey Kiwi]

Update: My Google-Fu is getting better.
I found this...
"Swapping the standard inserts with a pair of offset inserts will move the point of impact approximately 5" at 100 yards for the .005 inserts, 10" for the .010 and 20" for the .020".
So the 0.005 will give me 1.25" difference at 25 yards, and 2.5" for the 0.010 inserts.
Which means that probably the 0.005 are closer to what I need.
I have found a kit of the 3 sizes in NZ, and luckily asked about them as the dealer had another enquiry today and that person wants 2 kits. The dealer has only 3 kits coming in next week, and all are sold already now.
Anyway, I'm sorted now I think, unless one of you has the exact configuration that I have and can advise on what they used?
Thanks.

 

[Minshooter]

The only way to know the exact requirement is to shoot that exact rifle and adjust according to the target.
If you have only the opportunity to boresight, you can get quite close, while allowing for scope height.
Set the scope into the ring bottoms only, and switch the inserts around until you are there.
It is prudent to first confirm the optical centering, using a mirror.

 

[Grey Kiwi]

Yes, quite right.
As long as I can keep the scope 'inners' reasonably centred I will be happy.
Once setup I will take the rifle to the local indoor range for a shoot.
Won't touch the adjusters at first, but will work with the insert rings to get close to the target centre.
Then all should be fine, with the scope pretty much optically centred as well as it can be.
Thanks.

 

[6MMsteve]

ebay has tons of them

 

[6MMsteve]

you can shim under your base, using tape measure coil it already has the radius, use an old tape measure use the base to center the holes for drilling

 

[Herzo]

One thing that you may not realize is that you can "fine tune" your mount by only using an offset (say the 0.010 set) in one mount only, using the standard (0.0) in the other. Or a -0.010 in one and a +0.020 in the other.

 

[Grey Kiwi]

ebay has tons of them

Nope, been there.
Mind you, the way the internet works it may be that you get a 'different' ebay depending where you live.
If ebay sees that I'm in NZ, then maybe it prohibits me from seeing what you are seeing (in case I want to buy something that ebay thinks I shouldn't be allowed to).

 

[Darwin]

I think you should try to shim between the bottom insert and ring with Scotch tape. Haven’t done it but the gunsmith video where he turns a go gauge into a no go with 2 layers gave me the idea.

 

[Grey Kiwi]

I think you should try to shim between the bottom insert and ring with Scotch tape. Haven’t done it but the gunsmith video where he turns a go gauge into a no go with 2 layers gave me the idea.

Yes, could work.
However, I'm buying the wee set of 3 rings anyway so I should be OK with sorting out a combination with them.
I'm a bit worried that if I shim with tape, that the ring won't then self centre but will tend to stick instead.
But could be worth a try if I need to.

 

[6MMsteve]

take your rifle and scope set it up to 100 yds or whatever u shoot, set in a rest, bore sight to target then start swapping inserts until you have your desired effect, it's how I do it usually within 5 minutes I'm done, sometimes I setup for all elevation sometimes I center the scope, level your rifle level your target level your scope

 

[Ackman]

Yes, could work.
However, I'm buying the wee set of 3 rings anyway so I should be OK with sorting out a combination with them.
I'm a bit worried that if I shim with tape, that the ring won't then self centre but will tend to stick instead.
But could be worth a try if I need to.

You're correct. What makes the insert self center is being free to pivot inside the ring. If you need to use tape, use it between the insert and the scope.

 

[danny]

The only way I know of doing it is to bed the rings to offset the scope (against a boresighter). One of "those benchrest guys" explains how to do it in his book.

Danny

 

[CJ6]

Shoot the rifle with the .00 inserts in. Measure the distance between the aim point and impact. put the closest set of inserts in to make that distance up. It's just too easy to do.

 

[Grey Kiwi]

Shoot the rifle with the .00 inserts in. Measure the distance between the aim point and impact. put the closest set of inserts in to make that distance up. It's just too easy to do.

Thanks. I've never had Burris rings before. So a wee learning curve...but they seem to be what I want to get the scope pointing pretty much on target before I fiddle with the adjusters.
My 'best' rings were Conetrol on my .308 many years ago. Until then I just used cheap alloy (made in NZ) rings on everything as we didn't get much choice here years ago.

 

[Ackman]

Shoot the rifle with the .00 inserts in. Measure the distance between the aim point and impact. put the closest set of inserts in to make that distance up. It's just too easy to do.

Yes. A no brainer. I've used Signatures exclusively since about when they first came out and several times have needed the offset inserts. Far as I'm concerned they're simply the best and don't use anything else.

 

[CJ6]

You'll really like the Burris setup, and once you use it it's hard to go to another brand/type.. The bonus comes with the fact that you never have to worry about having ring marks on your scopes.

 

[Rook 6]

You should be able to get very close to what you are looking for with what you have. You can go from zero cant all the way to 20 MOA. I swear by Burris Signature Rings with the inserts. Never had them fail and never have had scope ring marks on a scope. They look good too.

 

[Coyotefurharvester]

Don't be surprised if you have windage correction also, the inserts can be oriented to reduce that in conjunction with vertical. Just takes time to get a clean zero at 25 yards with a scope. A laser boresighter may speed up the process.

 

[harro]

I don’t really understand your hesitancy to adjust your scope ?
Mount the scope in your Burris rings ( very good rings in my opinion ) and then zero your scope , the turrets on the scope are there for a reason .
Mounting your scope centered is a hangover from the days when optic quality and performance were no where close to what we have today.
If you feel that having to wind/ adjust your scope to zero it is effecting the accuracy/ results, then look for another scope .
Good luck with the 25yrd comp , I shot some years ago and had great fun .