Sniper Country Duty Roster collective wisdom


Learning to shoot in the wind.


Rick, Gooch, James : we have a problem with ranges and wind here, or the lack of it. Most
of our training is done on a bermed 300 Meter range with no wind.
I want to make a wind simulation target were I have a man size target on a bigger backer
and draw a second traget outline with a pencil next to it. I give the shooters information on
the ammount of wind and direction from which it is blowing and they dope and fire at the
target. The crew in the butts scores on the "invisible" pencil drawn target if the dope was
correct and ít was a hit or miss.
Any input Gentleman ?? Thanks

Ende!

Torsten <lasercon@dialup.globe.de>
in a phone booth, in Germany - Monday, October 05, 1998 at 08:08:58 (EDT)


Torsten - Wind doping ex. sounds good.

Another method might be to give the shooter the wind info, have them fire the shot with
correction (hold-off or sight adjustment), then have the pit crew measure the correction in
the pits. You, the instructor, knows the movement required and critiques after the shot.
This way all you need is a aiming point. You can vary the wind velocity, direction, distance,
etc. without needing to modify the target. I suppose you could even do the same thing with
determining elevation corrections.

Gooch
gooch <kdgooch@aol.com>
Sherwood, AR USA - Monday, October 05, 1998 at 14:51:28 (EDT)


What this tells me is that my wind estimation was OFF and I was essentially just getting lucky. Example: The Army chart gives 4.5 minutes for a full value 10 mph wind at 800 Meters. I have used that figure repeatedly to ding the target. Yet when compared to the balistic program for the same round, that call is off. So my assumption is that my wind call was actually off. This is kind of like voodoo! Why is this bugging me right now? I am trying to develop an accurate wind chart for my 26" PSS. Gathering all the various data has brought to light (at least for me) all the varying data out there. Guess I'll just have to stick with the Sierra program as verifying the windage for every 100 yards and every 3 mph all the way to 1000 would take a life time in waiting for each condition.

Scott <xring@voicenet,com>
USA - Friday, October 09, 1998 at 09:16:48 (EDT)


Wind, cripes, here comes the blankity blank chicken bones again. Scott you have probably over-estimated the wind on those shots. Most people do, and it causes no end to problems, especially at 1000 yards. That is why there are unlimited sighters at 1000 yards. I've seen world class shooters fire 5 - 10 rounds before the first one strikes paper. The reason is almost always because of over estimating the wind. Be sure you guys get the newest Sierra ballistic program and reloading manual. One thing you will find is that they dropped their ballistic co-efficients on almost all of their rounds. With 168 gr, you can use a constant of 10 for FULL moa wind corrections. The old stuff about that constant being for .5 moa corrections hasn't been valid since the late 80s (about 87). It took forever to get that misprint changed. If you look at the wind drift in the Sierra manual and then compute the same wind using 10 at 500 yards you will find that you are off by less than .25 moa. Now go to another round, say 190 gr Sierra in 300 Win Mag at 2900 fps and the constant is diffrenet. As a matter of fact you must use three constants to stay within .5 moa out to 1000 yards. Makes matters a lettle worse. And since the constants are 12, 13, and 14, then the math s**ks.

On estimating wind speed. Most people make it into something that is not. I am firmly convinced this was done years ago by good shooters to give them an edge over newbees. You estimate the speed of people, cars, objects, balls, clubs, etc. throughout your life. That's what keeps you from bouncing into each other at the mall. Look at the mirage and estimate it's speed. Take your first "gut instinct", don't change your mind or you will mess up. Look at the speed of the mirage based on how fast do you need to go to keep up. Can you stroll (2 -3 mph), fast walk (4-5 mph), jog (6-7 mph), run (8-9 mph), sprint (10-12 mph), or do you need to get in your car and chase the sucker down (12 and above). Of course in my case anything over 5 is get in my car and chase the sucker down. Then use the math of wind speed times range in hundreds divided by the constant of the round you are using. This gives you full value wind. Now decide if the wind is full or part value. Another place that many have problems. At 90 degrees, it is full; 75 degrees is .96 value; 60 degrees is .86 value; 45 degrees is .70 vlaue (NOT half); 30 degrees is .5 value; and 15 degrees is .25 value. At longer ranges you also have a verticle displacement of about .10 of the horizontal value at 1000 yards. When the wind is right to left the round climbs high and left to right goes low, (for a right hand twist, opposite for a left hand twist). A no value head wind causes the round to strike low and a no value tail wind will cause the round to strike high. As the part value wind starts taking effect the fun increases as to high and low and will drive a man to drink. Watch the mirage in multiple locations so that a wind change doesn't go unnoticed. Always evaluate each wind call and then look at the grass or leaves. This aids in computing values of wind. Watch the wind over multiple ranges to your target and find the dominant wind or if two winds cancel each other out. When the mirage goes squirrely, stop and wait, the wind is going to change it's mind and that's its warning to you. Unless you absolutely have to, don't shoot in a boil! I know everyone loves the no value boil. Bigger than Dallas that is when the wind will make up its mind to become a full value 5 mph left to right. Unless you have a steady no value wind, without a fishtail, then a boil is an ambush!

Dam Scott, I got going again. Feel free to edit what is too long of an explaination to a short question. I guess the students have me in answer man mode! Have fun guys and hold hard.

Rick <RBowcher@aol.com>
Fayetteville, NC USA - Friday, October 09, 1998 at 22:51:15 (EDT)


Back to Hot Tips & Cold Shots