long range .22lr and mount calculation question

[psychosomatic88]

I am looking at a Sportsmatch mount (AOP56) for having a go at long range .22lr.

I regularly shoot my Annie 1417 at 200 yards, and have shot further but run out of MOA adjustments in my current set up. Thats a weaver Grandslam 4.5-14 in medium mounts. To get out on the target I use the BDC and alter the zoom to correct the MOA drops. This works well enough most of the time but is a little crude. I aim off for wind. Altering MOA on the turret and large hold overs gets a bit messy for me.

So I was thinking about sticking my Meopta Meopro 6-18 (duplex ret and resettable target turrets) in the sportsmatch mount, maxing it up on mounts elevation and dialing the MOA corrections and just having a bit of fun.

Now, calculation wise, Im not sure if I got this right, but with the 2mm of elevation adjustment across the 110mm mount I make at 46MOA of elevation, which would be a great start. Have I worked that out right? Been some time since I did a bit of Trig.

Adjacent is 110mm, opposite is 2mm. I calculated the angle as 1.041degree, so giving Tan-1 of 0.078 and thus 46.8MOA elevation.

Or perhaps suggestions for an alternative but affordable mount that would give a good MOA advantage. I have the standard 11mm dovetail and also Weaver bases for mount options.

[Dougan]

I use a droop compensating mount for Long Range Rimfire - it enabled me to zero the scope at 200 with the turret wound all the way down, leaving enough elevation to get out to 400...
...I'll post some detail when I get back this evening.

[psychosomatic88]

That sounds ideal. Is that for the Bisley long range com?

[Dougan]

Yes, I use it for the Long Range comps at Bisley - There's one on the 26th of April; details are on the NRA web site.

This is the type I use:
http://www.uttings.co.uk/p110389-hawke- ... RR74fmsXW0

The Uttings site shows this one (dovetail) to be out of stock (says to email), but ones with weaver mounts are still available...

...they're a bit fiddly (and probably not robust enough for full-bore), in that after you've altered the angle with the wheel, you then have to lock it with a grub screw...this changes the position slightly, and it took me about 40 shots to set it up at just the right angle...

...but it is a perfect solution to the elevation issues with Long Range Rimfire, and mine's held it's position for two years.

There's some more info about LRRF in the link below (a thread from last year)...if you want any more info, just ask.

http://www.full-bore.co.uk/viewtopic.ph ... 2&start=60

[psychosomatic88]

Thats really helpful! I saw the comp on the NRA page which is where I got the idea from. At the moment I only do it casually but really enjoy it.

I will have lots of other questions, but for now, my two rifles to hand are an Anschutz 1417 or a beretta weatherby xxii semi auto, 24" barrel (iirc) and a match chamber. Both shoot very well with their favourite ammo.

I was thinking the Anschutz as its easier to load single shots. I have the choice also of expanding or target ammo, win subs shooting very well out of the 1417 and being subsonic would avoid any transonic instability. Or is this just garbage and I should go out and buy some decent HV then go with the longer barrel?

I appreciate both are sporters, but there I think is the charm as it would be simply a bit of fun.

[billgatese30]

Am I thinking of this wrong or reading your original statement wrong? How did you get 1.042 degrees to 46 MOA? 60MOA is equal to 1 degree. So should you not be looking at 62.5 MOA? I think looking at it, you might have pressed Tan-1 once too many times.

2/110 = 0.0181818 -->
"tan-1" = 1.0416 Degrees
1.0416*60 = 62.496 Minutes (i.e. MOA)

[DW58]

My goodness this is getting way too complicated for me ... ... ... I though Tan was a colour of shoe polish

[morph007]

While doing some 500yd shooting at Bisley last week, took a few shoots with my little .22 just for fun. Worked out that I've got to aim for top of the trees behind the sandbank to hit the target.

Flight time about 2 seconds though it seems much longer. Think I'll go back and try 600 yds next week.

[Dougan]

Thats really helpful! I saw the comp on the NRA page which is where I got the idea from. At the moment I only do it casually but really enjoy it.

I will have lots of other questions, but for now, my two rifles to hand are an Anschutz 1417 or a beretta weatherby xxii semi auto, 24" barrel (iirc) and a match chamber. Both shoot very well with their favourite ammo.

I was thinking the Anschutz as its easier to load single shots. I have the choice also of expanding or target ammo, win subs shooting very well out of the 1417 and being subsonic would avoid any transonic instability. Or is this just garbage and I should go out and buy some decent HV then go with the longer barrel?

I appreciate both are sporters, but there I think is the charm as it would be simply a bit of fun.

You'll obviously get better scores with a rifle with a long heavy target barrel (Anschutz and BSA target rifles seem to do the job quite nicely), but we are pretty 'casual' about it, and folk come with all sorts of rifles to see what they can do, just for fun...give the Anschutz a go; the bolt action would be better.

As for ammo - Any decent ammo that your rifle likes is good...you do get what you pay for, and any of the top end match ammo from RWS, Lapua and Eley seems to produce some good results...I use RWS R50 - I did dabble with R100 (HV) but agree with yourself that transonic instability could be a problem...I thought I got better groups with R50; but group testing .22LR at 300 yards isn't the most exact science...

[Dougan]

While doing some 500yd shooting at Bisley last week, took a few shoots with my little .22 just for fun. Worked out that I've got to aim for top of the trees behind the sandbank to hit the target.

Flight time about 2 seconds though it seems much longer. Think I'll go back and try 600 yds next week.

From a 25 yard zero, with standard velocity ammo (1075 fps), it's around 85 mins of elevation to 400 yards, and at least another 30 to get to 500...so well over a hundred minutes - I've got my scope zeroed at 200 and run out of elevation after 400; so have to aim into the sand above the frame at 500.

Btw: Don't try shooting .22 past 600 (and I'd check with the range office to make sure they're happy with that)...beyond that the bullets hit the target at such an angle that there is the possibility of them ricocheting back off the target frame.