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.22 LR ballistics

 
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  #8  
Old 02-21-2005, 08:19 AM
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Location: Suffolk,.UK
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Re: .22 LR ballistics

Hello 700

Nice to meet you too , the wife is half irish (southern) so we might even be related !!

That might be the case then 1cm @ 100 I think I need to get back out there and loose off some more groups.
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  #9  
Old 02-21-2005, 01:51 PM
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Re: .22 LR ballistics

Does a cross range wind cause vertical deflection?
You betcha.
This is one of those strange quirks that are is very readable in smallbore rifles (22s) even at 50 yds, but you rarely see them in centerfires unless you are shooting benchrest, or beyond 800ish yards.
This is probably the best graphic that shows this effect.


The graphic says deflection is 10 o clock to 4 oclock, and thats a pretty good estimate. 10-4 is a 30 degree deflection. This translates to .573 inches of vertical displacement for each inch of horizontal deflection. maybe an example will make this clearer.
10mph, wind from 3 oclock
100yd wind drift=7.5 inches of horizontal drift, and 4.29 inches of vertical, in this case, up.
150yd wind drift=25.5 inches of horizontal drift, and 14.61 inches of vertical, in this case up.

30 degrees is about the most extreme vertical I have ever experenced.
I find that 10-15 degrees is usually a bit closer.
10 degrees translates to .172 inches of vertical for each inch of horizontal deflection. The above example would look like this:
10mph, wind from 3 oclock
100yd wind drift=7.5 inches of horizontal drift, and 1.29 inches of vertical, in this case, up.
150yd wind drift=25.5 inches of horizontal drift, and 4.38 inches of vertical, in this case up.

This effect seems to vary from bullet to bullet, and I havn't shot this particular bullet enough to quantify a value for this effect, with this bullet. I would speculate that this bullet will fall somewhere between the 10 degree, and 30 degree data. As you can see, it wouldn't be difficult to get quite a bit of vertical in a 10-20mph cross wind.
Most of my "LR" shooting with 22's is done with either the PMC Scoremaster (bc .165) or a hollow point bullet formed from the same on a set of custom dies, so I can't give you an exact value but the above examples should get you pointed in the right direction. They were calculated for the CCI Subsonic Hollow point bullet.
Keep in mind that 25" of wind drift at 150yds for a 22 is equal to 500yds with my preffered long range rifle, the 300WM.
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  #10  
Old 02-22-2005, 12:12 PM
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Join Date: Jan 2005
Location: Suffolk,.UK
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Re: .22 LR ballistics

That has to be it!

No reply from S&B yet.
I am going to have to bench it and look at a scaled target to see how much movement the clks give me then Im all set I think!

Thanks abinok
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  #11  
Old 02-25-2005, 02:42 AM
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Location: Suffolk,.UK
Posts: 154
Re: .22 LR ballistics

Schmidt & Bender just got back to me! Would you believe my PMI 3-12x50 has an adjustment of 0.7cm @ 100M!
Reshot some groups last night and I am getting impact at the right level for new/identified clk value (PS the wind was a lot less as well)
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