Rimfire Ballistic charts

cz452shooter

cz452shooter

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Here are some ballistic/trajectory charts for the rimfire calibers.

RimfireBallisticswindchart-1.jpg


RimfireKineticEnergyChart-1.jpg


RimfireVelocitychart.jpg


RimfireDropChart.jpg


Software used: Point Blank down-loadable software.

Barrel Length: No barrel lenght was indicated but is most likely around 22-24".

Action type: Again, no action type was indicated but is most likely bolt action. You can expect a tiny (bairly noticeable)
loss of Velocity in semi-automatic actions because of the energy it takes to push the bolt back.

Regards,
Jordan
 
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Great chart but I noticed one typo. Shouldn't it read altitude not aptidude. Other wise thanks for the great info.

Altitude:
The height of a thing above a reference level, especially above sea level or above the earth's surface.

Aptitude:
An inherent ability, as for learning; a talent. Quickness in learning and understanding; intelligence. The condition or quality of being suitable; appropriateness
 
Nice work, but the axes could use some labelling.

For example, what's the Y axis numbers on the wind chart? (The text says it's for 10mph crosswind, so I'm not clear what the numbers are on the Y axis. I think it's clear X is range though).
 
michaelsabre said:
newbie question:

How come the wind deflection of 22mag 40g is much greater than that of 22LR 40g standard speed?

Thanks in advance
Click to expand...
If the bullets are the same shape and mass than the wind deflection per second will be the same. But the high velocity bullet travels further per second.
 
This software was developed for air rifles, but it may work for rimfire if you know your bullet grain and fps. I use it with my Condor. It's a pretty interesting piece of work and there is also a target generator.
http://www.chairgun.com/
 
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Great charts, what's the software? Also, what velocity of crosswind did you use and what is the direction?
 
If you check on rimfire.com there is a good table of ballistic co-efficients for various rimfire rounds. (ok for virtually all of them).

This combined with the above type data in a ballistics program would let you generate similar tables for any set of ammo you happen to like to shoot.

If you have a chrony or can borrow one then you can tune it to the actual velocities the ammo produces in your gun for real customs results.

But these definitely show the basics relative to each other. Nice tables!

However I do think there's a mixup if the 22Mag has more wind deflection than the 22LR. The shape and mass determine the drift, but if one is going fifty percent faster its going to be travelling for much less time so drift will be less. The other factor is how fast the round loses velocity (and then we're back to BC again).
 
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No mixup, a faster-moving 22 is more affected by wind drift than a slower one. The reason is because it is _shedding speed_ much more quickly at supersonic speed; it's a ballistically-inefficient projectile, and at supersonic speed it slows down very quickly. The rate at which the projectile is slowed by passage through the air is directly related to the degree that wind can push it around. So the subsonic .22 projectile, though it takes longer to reach the target, for some reason gets blown around less while it does so.

It's not intuitive at all, but it's apparently true... the first time I read about it was here:

w w w .chuckhawks.com/22_rimfire_cartridges.htm

"Specialized rifle and pistol target loads are available. These 40 grain lead RN bullets are loaded to a velocity just below the speed of sound, to minimize velocity loss and thus wind drift."

And Ackley backs it up, I'll have to dig up the article from his Vol. 1 IIRC...
 
Ok Guys, I fixed up the charts a bit. I added a Y and X axis, made the charts a bit smaller, changed the titles a bit, and added some additional information. If there are any further questions about the chart, feel free to ask :).

I have also added a Rimfire Velocity chart.

Regards,
Jordan
 
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