Options for 20 MOA of elevation/canted scope mount

[Ballistix]

Should be ok to zero at 100 with a 100 moa scope if he's zeroing using 60moa already (if my maths works out that is razz )

Worth noting that my mate used the 30 moa mount as that was what he needed with his lesser amount of moa on his scope to start with and the weight of bullet he wanted to use, you should be ok with a 20 moa mount....... (Again if my maths work out :lol: )

Hi Matt.

My thinking around the 30MOA slant was that I had 60 MOA in the bank as you say so could afford to drop back by more than 30MOA if needed to zero at 100yards. For the the 155g Sierras I was using I was maxed out at 97ish MOA and had to hold over onto the 5th line down on the reticle (see image) which is a total of 10MOA at a 'certain zoom level' but not the 22x zoom power I was on at the time so I kind of lost track of my maths. I want to ammo test for grouping with 168g too so I would need a fair bit more elevation over the 155s I thought. I wouldn't want to buy a 20 MOA mount only to find out in a few weeks that I needed 21 MOA but at the moment I'm not 100% how I can be 100%

When I have time I'll sit down and try and work it all out.

http://www.google.co.uk/imgres?imgrefur ... =750&w=750

[Ballistix]

Have you considered the Burris Signature rings?
They come with shims up to 20 moa and are a good price,

DM

Hi Dm yes I did see those but was a bit gut feel sceptical base on no experience. Thanks for pointing it out. Do you use them?

[rox]

I want to ammo test for grouping with 168g too so I would need a fair bit more elevation over the 155s I thought.

Make sure that you aren't using one of the 168 grain bullets that were designed specifically for 300m shooting; they have a boat tail angle that leads to instability at longer ranges. There is nothing wrong with the 168 gr weight for longer range per se, but most of the 168 grain bullets around are based on the Sierra 2200 design and share the same boat tail angle. With these bullets it is not uncommon to find that they tumble at 1000 yards, evidenced by elongate holes in the target.

..

[Dangermouse]

I have used them and highly recommend them. Additionally the inserts prevent your scope from getting some scratched.

DM

[ovenpaa]

Take your 'scope to it's 100 yard zero, make a note of the position and wind it down, how many MOA does it have to go to bottom out?

[Ballistix]

Take your 'scope to it's 100 yard zero, make a note of the position and wind it down, how many MOA does it have to go to bottom out?

Bottoms out 65 MOA below my 100 yard zero.

[ovenpaa]

Wow! I normally expect to see them at plus 7-12 minutes on a 20 minute rail or around 30 ish minutes max, not 65! You effectively need anything up to 2,3mm shim at the back end. IOR make a set that allows you to dial in what you need to get to zero and TET make unimounts up to 40 minutes however both are pricey options.

What do Steyr recommend?

[Matt]

Should be ok to zero at 100 with a 100 moa scope if he's zeroing using 60moa already (if my maths works out that is razz )

Worth noting that my mate used the 30 moa mount as that was what he needed with his lesser amount of moa on his scope to start with and the weight of bullet he wanted to use, you should be ok with a 20 moa mount....... (Again if my maths work out :lol: )

Hi Matt.

My thinking around the 30MOA slant was that I had 60 MOA in the bank as you say so could afford to drop back by more than 30MOA if needed to zero at 100yards. For the the 155g Sierras I was using I was maxed out at 97ish MOA and had to hold over onto the 5th line down on the reticle (see image) which is a total of 10MOA at a 'certain zoom level' but not the 22x zoom power I was on at the time so I kind of lost track of my maths. I want to ammo test for grouping with 168g too so I would need a fair bit more elevation over the 155s I thought. I wouldn't want to buy a 20 MOA mount only to find out in a few weeks that I needed 21 MOA but at the moment I'm not 100% how I can be 100%

When I have time I'll sit down and try and work it all out.

http://www.google.co.uk/imgres?imgrefur ... =750&w=750

Just for clarity as it's easy to get a bit mixed up

Your scope is adjusted 60 moa at your 100 yd zero? - so with the scope wound right down you have to bring it up 60 minutes to zero at 100....... This is slightly different in your posts as you also say you have 60 minutes in the bank at 100, this would mean that with your scope wound right down you would need to bring it up 40 minutes ?

The latter makes more sense for a 100 zero on a 100 moa of elevation scope, can you confirm which way it is as it would make a lot of difference to which base you use?

Can you also confirm if it is the 5.5 x22 nightforce that you have, if not which scope is it?

There's quite a lot to consider in shooting this combo out to long range but it is very do able - don't be tempted to use the 168s as they will probably keyhole at 1000 (mine did :lol: )

Are you using home loads or reloading your own 155s?

Sounds all a bit daunting but easy when you know how and there's loads of info on the forum to get you there ...... Just need to get confirmation on the figures first :goodjob:

[Dangermouse]

I was thinking about this on the way home, I am not familiar with your rings - is there any chance that they have a 20 moa base and that they have been installed back to front, reducing your set up by 20 moa?

Also, I am guessing that rifle has at most a 26" barrel, are you aware of how much your rounds are dropping at that distance? Most .308 ammunition will be going transonic after 800 yards, exactly what it would be doing at 1100 yards would be interesting.

DM

[Ballistix]

I was thinking about this on the way home, I am not familiar with your rings - is there any chance that they have a 20 moa base and that they have been installed back to front, reducing your set up by 20 moa?

Also, I am guessing that rifle has at most a 26" barrel, are you aware of how much your rounds are dropping at that distance? Most .308 ammunition will be going transonic after 800 yards, exactly what it would be doing at 1100 yards would be interesting.

DM

Hi DM - The rings are these. http://warnescopemounts.com/product/max ... ach-rings/ It would save me some money if they were canted and fitted inverse but I fear not.

The rifle has a 24" barrel. My estimate was that the rounds would need over 40 MOA to hit centre at 1000 let alone 1100yards. I specifically asked the butts on the radio what shape were the holes in the target and they said perfectly round which surprised me greatly. The rounds are HPS target master 155g Sierra MK with Lapua cases from Bisley measuring at 2750fps average on my Chrony.