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Sticky Topic Sighting in your .22lr (Read 29881 times)
Vanman
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Sighting in your .22lr
Mar 31st, 2010 at 11:56pm
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I thought it was worth pulling this together into one post, maybe even making it a sticky.

This has been unashamedly pinched from the Gunsmoke website (link further down).


One of the better methods for sighting in a .22lr is the point blank method.

I'll give a summary if you just want to get out and shoot, and a link to the web page with all the details if you are stuck at a desk at work, or want to do some tricky stuff.

Point blank range is the distances between which a bullet will hit inside a defined vital zone when aimed smack in the middle of that zone. This method of sighting in aims to maximise that range.

For small game, a 25mm (1 inch) radius zone (that's a circle 50mm or 2 inches across) makes most sense as it caters for head and chest shots on most common small beasties we shoot her in NZ.

So, for subsonic .22lr ammo (40 gr), if you sight in at 47.5m (52 yards) you will hit inside the vital zone between ranges of 16.5m (18 yards) and 54m (59 yards).

For supersonic .22lr ammo (40 gr) if you sight in at 54m (59 yards) you will hit inside the vital zone between ranges of 18m (20 yards) and 60m (66 yards).

For hyper velocity .22lt ammo (CCI Stingers in this case) if you sight in at 78.5m (86 yards) you will hit inside the vital zone between ranges of 6.5m (7 yards) and 89m (98 yards).

Beyond those ranges, you need drop charts, or a bunch of practice (guess which one is most fun?)  Grin

If you put 40 gr supers in a rifle that is sighted in point blank for 40 gr subs as above, then the supers will be point blank between 5.5m (6 yards) and 62 m (68 yards)

That means you don't get much extra distance with the required accuracy, just a round going faster and making more noise!  Huh

For all the details, and the drop charts, have a look here.

If you want to have a play yourself, try these links:

This is a simple, metric, web based ballistics program

And this is the imperial version

These don't have drop charts but give you the basic results in a table.

You can lift the basic starting data from the page on point blank sighting in, or you can use this info on basic ballistic coefficients for .22lr rounds.

Hope that is some help to people and have fun out there.  Smiley



[Edit: corrected range error -- blackbunny]
« Last Edit: Apr 15th, 2010 at 12:24am by blackbunny »  

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Re: Sighting in your .22lr
Reply #1 - Apr 7th, 2010 at 10:02am
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Vanman wrote on Mar 31st, 2010 at 11:56pm:
So, for subsonic .22lr ammo (40 gr), if you sight in at 47.5m (52 yards) you will hit inside the vital zone between ranges of 16.5m (18 yards) and 54m (52 yards).


Great post and I'm going to try it out.

But you might like to revisit the above were 47.5m (52 yards) = 54m (52 yards). Wink
  
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Vanman
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Re: Sighting in your .22lr
Reply #2 - Apr 7th, 2010 at 9:03pm
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Hmmm, yeah I messed that one up. That'll teach me for trying to work with 3 websites at once!  Embarrassed

I would fix it, but for some reason I can't edit that post any more.

Perhaps a friendly Duck Gunner will make the followings edits for me?  Wink

Point blank range is the distances between which a bullet will hit inside a defined vital zone when aimed smack in the middle of that zone. This method of sighting in aims to maximise that range.

So, for subsonic .22lr ammo (40 gr), if you sight in at 47.5m (52 yards) you will hit inside the vital zone between ranges of 16.5m (18 yards) and 54m (59 yards).
  

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Re: Sighting in your .22lr
Reply #3 - Apr 8th, 2010 at 8:21am
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Good post Vanman,

I must admit I only shoot subs in my .22lr which is zeroed at 50m.
I did try HV but not really gaining anything, its much louder than suppressed subs and you don't really gain much in accurate range.
If I want to shoot at over 80m+, I used the 17hmr, it's designed for long range,.22lr is not.

Dave.
  
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Re: Sighting in your .22lr
Reply #4 - Apr 14th, 2010 at 11:38pm
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Thanks Vanman, that is very helpful indeed.
  
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Re: Sighting in your .22lr
Reply #5 - May 12th, 2010 at 2:07am
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Very helpful.

If you want to calculate different PoI's for different ammo - say sub's out of a rifle zero'd for HV's here's how...

Use the above links to calculate your regular ammo trajectory. Make note of the Total Drop value at each range increment. In my case my primary is Hypers.

Then load in your 'other' ammo. In my case ... sub's

To calculate the sub trajectory take the total drop differences between Hyper and Sub, and apply that to the Hyper trajectory.

For example, my hypers are zero'd @ ~ 87 yards. At 50 yards my hypers trajectory is 1.23 inches above zero. The total drop value is 1.81 inchest.

The total drop value for subs @ 50 yards is 3.94 inches.

The total drop difference is 1.81-3.94 = -2.13 inches.

Add -2.13 inches to my HV trajectory (1.23 inches)... ie -2.13+1.23 = -0.9 inch.

So at 50 yards my hypers are 1.23 inches high, sub's are .9 inches low.

You can even throw it into an excel chart:



  
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Re: Sighting in your .22lr
Reply #6 - Jun 7th, 2010 at 3:08am
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Nice post, very very helpful Wink
  
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Re: Sighting in your .22lr
Reply #7 - Jun 7th, 2010 at 9:11pm
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my 22 is sighted for 80m and requires only slight adjustment by me when i shoot depending on range. its good to 100m and anything in between. i just need to account for it. 80 m is a good distance. we shoot hares the size of small dogs and the subsonic nearly bounces off.
  



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Re: Sighting in your .22lr
Reply #8 - Jun 11th, 2010 at 9:49pm
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Cheers, Just bought a Norinco jw15a will try this out over the weekend. Also hello to everyone, I have been a guest on this site for awhile and just recently registered. Some very interesting topics out there.
  
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Re: Sighting in your .22lr
Reply #9 - Sep 18th, 2010 at 10:20am
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Its sound good to me .
  
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Re: Sighting in your .22lr
Reply #10 - Nov 10th, 2010 at 10:38pm
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thanks for the info. I have my 22lr sighted in so its smack on at 75m with high velocity ammo and haveing it sighted in at that range works well for me Smiley
  
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Re: Sighting in your .22lr
Reply #11 - Dec 9th, 2010 at 10:47am
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shoot it in at 15 good paces puts you bang on again at 75 and good out to a 100. We used this method for many years on the rabbit board.

Shooting it in at 15 paces (yards) means you should be able to hit a ammo packet at 100 (aim for the top edge)

All our shooting was done with a ruger and Nikko 4x32  Smiley
  

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Re: Sighting in your .22lr
Reply #12 - Jan 28th, 2011 at 9:53am
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exactly the way i do it also with the anschutz but i use the top or bottom thick part of the cross hairs for near or far Roll Eyes Roll Eyes
  

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Re: Sighting in your .22lr
Reply #13 - Feb 14th, 2011 at 4:21am
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i sight in smack on at 25 yards and have no probs i shoot a 22 for a living a lot of the time so im not into wasting ammo as it costs to much

every gun is different and the same with the ammo its what you are used to that makes the difference
  

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Re: Sighting in your .22lr
Reply #14 - Apr 28th, 2011 at 11:34pm
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Thanks for that info. Thats how i did it in the past but forgot how, maybe age has something to do with it.

cheers
  
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