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

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:

Hi again - Answers in short below:

Yes the scope reads 60 MOA when the rounds are going through the bull at 100yards.

If I wind the scope right down it hits -5 MOA so I have to bring it up to read 60 MOA for 100 yard zero and at 600 yards on Saturday it was reading 76.75MOA so an addition of 16.75 MOA to go to 600 yards which makes sense right?

Scope = Nightforce NXS 5.5-22x56 (30mmtube)

The 155g rounds were HPS target master bought from Bisley and measure 2750 fps MV on my chrony.

Darn just bought 100 168g Sierra MK and 100 168g Amax heads to start home loading :roll:

I have a suspicion that, on my Steyr, the distance between the centre of the scope and the centre of the barrel is huge so might be making the 100yard zero such an odd starting point. There is a lot of metalwork in between.

I hope I'm not annoying people with my first post here!!!

[Matt]

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[/quote]


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: [/quote]

Hi again - Answers in short below:

Yes the scope reads 60 MOA when the rounds are going through the bull at 100yards.

If I wind the scope right down it hits -5 MOA so I have to bring it up to read 60 MOA for 100 yard zero and at 600 yards on Saturday it was reading 76.75MOA so an addition of 16.75 MOA to go to 600 yards which makes sense right?

Scope = Nightforce NXS 5.5-22x56 (30mmtube)

The 155g rounds were HPS target master bought from Bisley and measure 2750 fps MV on my chrony.

Darn just bought 100 168g Sierra MK and 100 168g Amax heads to start home loading :roll:

I have a suspicion that, on my Steyr, the distance between the centre of the scope and the centre of the barrel is huge so might be making the 100yard zero such an odd starting point. There is a lot of metalwork in between.

I hope I'm not annoying people with my first post here!!![/quote]


First things first.... Don't worry about asking questions as we've all had stuff that's driven us nuts until someone's made sense of it all

Secondly, your 168s are not in vain but I probably wouldn't use them past 600.

Now then..... Your elevation between 100 and 600 with your set up and ammo seems about right, what is odd is the starting place for your 100 yd zero as it sounds at least 20 moa out?

As DM suggested are you sure your mounts aren't the wrong way round ( a good side on photo would be good, always nice to see a a bit of gun porn on here tongueout )

As a side thought if your kit is relatively new..... Has your scope got zero stop fitted and is it properly adjusted or used at all, could account for 20 minutes (just thinking out loud) - when you wind the turret right down what do the lines on the turret show? (Again some pics would be helpfully)

It's also worth remembering that to a certain extent your pushing it a bit at 1100 with a relatively short barrel and ammo that is ok but quite slow out of your gun, this in itself means that your elevations will be quite high in reality (perhaps Ovenpaa could run the numbers on quickload for you sign92 )

Don't worry though as we'll get there soon once you're scope is sorted and you know the realistic confines of your set up you will be able to make the adjustments to suit

[Matt]

Last post got a bit quote heavy so I've removed some of it but read the last bit I added sign01

[Dangermouse]

If I am using the Litz ballistic program correctly - and I am guessing the scope hight at 2.5"

At 1000 yards the 155gn will be doing 1023 fps
At 1100 yards 974 fps

Assuming 100 yard zero (0 moa)

-41 moa at 1000 yards
-50 moa at 1100 yards

Dm

[Dangermouse]

http://appliedballisticsllc.com/ballistics/php/ab.php

[Dombo63]

I have a 20 MOA Farrell rail and with the scope zeroed at 100yds I need approx 10 milrads to get me on target at 900 yards, and I'll have run out of clicks at 1200. That's using 168gn Prvi Match rounds, but no great scores at that range. The rifle's previous owner had some success with home-loaded 155 Scenars out to 1000 yds so I'll be trying them too at some point.

[Ballistix]

Hi again and thanks for the comments.

Pics attached.

My Nightforce is not the zerostop version.

Sight height is over 2.75 inches.

[Ballistix]

One more pic

[Matt]

Hmm, have you had the scope long and did you buy it new as I'm pretty sure your 20 mins adrift somehow....

That scope should get you there quite easily but the 65 moa 100yd zero is too much even on a flat base


I'll be at Bisley on the 9th march if you're down that way and I can bring my scope (same as yours) on its one piece mount if you want to test yours against it as it will only take a few mins to swap them over, doing a direct comparison will show if yours is ok or not and give you your next step......

[Ballistix]

Yes the scope was brand new from SGC a year ago so I'd really hope it is 100% functional what with it's marriage testing cost!!

That's a really kind offer to test at Bisley appreciate it. I work in the Surrey area sometimes but am 100 miles from there at weekends.

I wonder why I'm having to 100yard zero so high at 65MOA then? If I can figure it out I shouldn't need to fork out on a pricey new single/canted mount.