Liven The Dream
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May be a few days need printer ink at the House ?
Wind drift cheat sheet
- Thread starter Lkwebb
- Start date
May be a few days need printer ink at the House ?
I have found this to be absolutely true. I shoot two different ranges that have different mirage and wind factors due to orientation, cover, and time of day that affect POI.
Then I hunt varmints at several different farms and the differences are magnified. I am getting better at reading mirage, but dealing with wind is a bigger challenge for me due to the changes in direction and speed at different times and / or points along the bullet path.
I will purposely go to the range on days when the winds are forecasted for 10 to 25 mph and practice just to see how I can manage wind because we can't control the environment, only learn to adapt to it. However, it can be sobering shooting in these conditions. My "workout" consists of trying to time the shot between gusts without jerking the trigger off center. This training helps.
For me, dealing with the environmental conditions is the most significant issue in making the shot, not how I clean the rifle or the reloading procedures I employ.
Ned Ludd
Silver $$ Contributor
Keep in mind that when it comes to using a cheat sheet during a match, simple is better. Using a cheat sheet that is so complicated and/or difficult to use that the wind condition changes 27 more times while you're still figuring out where you needed to hold for the first change isn't helpful.
I would suggest making your own, using a simple clock diagram and approximate relative [horizontal] wind values to start. Obviously, 12:00 and 6:00 = zero, and 3:00/9:00 = full value (100%). 1:00, 5:00, 7:00, and 11:00 are each 30 degrees off the 12:00/6:00 axis, and thus equal a 50% effect (sine 30 degrees = 0.50). 2:00, 4:00, 8:00, and 10:00 are each 60 degrees off the 12:00/6:00 axis, and thus equal a 90% effect (sine 60 degrees = 0.87). This greatly simplifies the amount of information needed to be memorized and greatly speeds up the interpretation/reading process during match conditions. Anyone should be able to memorize only three relative values (i.e. 0%, 50%, and 90%), and I going to assume all of us already know the 12 clock positions.
Next, make up a simple chart of wind deflections for each of the distances you typically compete. For example, I might make up two separate charts for 600 yd and 1000 yd. The chart will contain the wind deflections in either MOA or Milliradians for full-value conditions (i.e. 100%, wind from 3:00 or 9:00) for something like 1 to 10 mph in 1 mph increments, plus maybe 15 mph and 20 mph. Once you realize that wind deflection is additive for different wind speeds when shooting at a single specificed distance, you will also realize that making a chart with wind in single mph increments up to 30 mph is unnecessary. Again, simple is better.
With these two pieces of information (i.e. wind value relative to a full value wind, and wind deflection amount for a given wind speed at a certain distance), one need only multiply the two values in their head to come up with a realistic hold-off. For example, one has a load with a wind deflection value of 4.0 MOA per full value 10 mph wind, and they're looking at an 8 mph wind from 1:00. 80% of 4.0 is 3.2 MOA, and it's a half-value wind (i.e. 50%), so the hold-off would be 1.6 MOA. With a minimal set of values to be memorized, these calculations will usually become 2nd nature in almost no time because everything is simplified to make the whole process easier. In fact, most people will be able to make such calculations almost instantaneously with only a small amount of practice.
Once the simplified conversion factors and windage values are "locked in the vault", one can then start adding additional tools such as the slight vertical induced from right- or left-value winds due to bullet rotation. But it's not necessary to pile everything on right from the start. Build the toolbox slowly, starting with the simplest possible instruction set. That approach will typically make the whole process easier.
I would suggest making your own, using a simple clock diagram and approximate relative [horizontal] wind values to start. Obviously, 12:00 and 6:00 = zero, and 3:00/9:00 = full value (100%). 1:00, 5:00, 7:00, and 11:00 are each 30 degrees off the 12:00/6:00 axis, and thus equal a 50% effect (sine 30 degrees = 0.50). 2:00, 4:00, 8:00, and 10:00 are each 60 degrees off the 12:00/6:00 axis, and thus equal a 90% effect (sine 60 degrees = 0.87). This greatly simplifies the amount of information needed to be memorized and greatly speeds up the interpretation/reading process during match conditions. Anyone should be able to memorize only three relative values (i.e. 0%, 50%, and 90%), and I going to assume all of us already know the 12 clock positions.
Next, make up a simple chart of wind deflections for each of the distances you typically compete. For example, I might make up two separate charts for 600 yd and 1000 yd. The chart will contain the wind deflections in either MOA or Milliradians for full-value conditions (i.e. 100%, wind from 3:00 or 9:00) for something like 1 to 10 mph in 1 mph increments, plus maybe 15 mph and 20 mph. Once you realize that wind deflection is additive for different wind speeds when shooting at a single specificed distance, you will also realize that making a chart with wind in single mph increments up to 30 mph is unnecessary. Again, simple is better.
With these two pieces of information (i.e. wind value relative to a full value wind, and wind deflection amount for a given wind speed at a certain distance), one need only multiply the two values in their head to come up with a realistic hold-off. For example, one has a load with a wind deflection value of 4.0 MOA per full value 10 mph wind, and they're looking at an 8 mph wind from 1:00. 80% of 4.0 is 3.2 MOA, and it's a half-value wind (i.e. 50%), so the hold-off would be 1.6 MOA. With a minimal set of values to be memorized, these calculations will usually become 2nd nature in almost no time because everything is simplified to make the whole process easier. In fact, most people will be able to make such calculations almost instantaneously with only a small amount of practice.
Once the simplified conversion factors and windage values are "locked in the vault", one can then start adding additional tools such as the slight vertical induced from right- or left-value winds due to bullet rotation. But it's not necessary to pile everything on right from the start. Build the toolbox slowly, starting with the simplest possible instruction set. That approach will typically make the whole process easier.
I’ve always struggled with the positions of #5, 6, and 7, relative to one another. Seems tough to believe.
Dave
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