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- Thread starter 86alaskan
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The bullet won't be affected by the wind where you are.

It's only there for a nanosecond.

It will be affected most by winds between you and the target.

The farther and slower it goes, the more it will be affected.

It's everywhere for a nanosecond. If it is bumped 1/10 MOA in the first ten yards that does not get less the farther it travels. If it gets bumped another 1/10MOA in the next ten yards now it is 2/10 MOA. This 2/10 goes not become less the farther it travels. If it gets bumped a 1/10 MOA in the last ten yards before the target it will not be noticed.

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- Jan 3, 2017

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The slower the bullet is travelling the easier it is for the wind to move it, it is also easier for the wind to move a lighter bullet compared to the heavier bullets. This is why the big Burgers and other large bullets will usually be a better choice for long range shooting.

Need the three variable that will affect the flight. The weight, the time in flight and the speed of the wind.

On another note, shooter puts the drift I was experiencing at 4moa at 500 with an 8mph full value cross wind. So, I was at least 20in off, and maybe more because I was correcting for a light right to left wind farther down range.

Use this free ballistics calculator and your question will be answered.RonS,

Let's give both bullets the same time of flight and the same wind speed. While we're giving the 6.5 gets 125 grains and the .338 gets 180 grains. Now what?

http://www.jbmballistics.com/cgi-bin/jbmtraj_drift-5.1.cgi

Use this free ballistics calculator and your question will be answered.

http://www.jbmballistics.com/cgi-bin/jbmtraj_drift-5.1.cgi

Yes, that will provide the answers. I use Strelok on my phone.

RonS,

Let's give both bullets the same time of flight and the same wind speed. While we're giving the 6.5 gets 125 grains and the .338 gets 180 grains. Now what?

There is more force required to move the heavier object the same distance. In your example though, both 125 and 180 are low weights. I'd go with 140 and 300 (assuming 338 Lapua).

There is more force required to move the heavier object the same distance. In your example though, both 125 and 180 are low weights. I'd go with 140 and 300 (assuming 338 Lapua).

RonS,

Let's give both bullets the same time of flight and the same wind speed. While we're giving the 6.5 gets 125 grains and the .338 gets 180 grains. Now what?

Wind drift is about the ballistic coefficient and velocity which establishes the dwell time for the wind to drift the bullet. Weight is not the determinant. Just turns out that the heavy for caliber bullets generally have higher BC’s then the lighter bullets. A 300gr bullet from a 338 Lapua and a 140gr in a 6.5 Creedmoor, both staring out at 2800 FPS with identical BC’s will have comparable wind drift characteristics. I have experienced this with my shooting out 1000+ yards in a constant speed/direction of wind.

IMO, without sophisticated methods, it is virtually impossible to predict the exact effect of the wind for a given shot, particularly at the longer ranges. Lots of practice makes you better, but not perfect. I found an excellent practice method is shooting my precision 22LR from 50-300 yards. I shoot all year round going through several ‘bricks” of ammo with the particular goal of learning how to more accurately determine wind. My 22LR behaves very similarly to my centerfire with drop and wind drift calculations, accurately determined by a ballistic calculator. If you establish an accurate velocity and BC for the 22RF, it works perfectly in a ballistic rangefinder out to 300-400 yards. The difference is “range” scale. My rimfire at 200 yards with 10mph, 3’clock, wind has the same 6.5 MOA wind drift(and .5MOA accuracy), as my 6.5x47 Lapua at 1200 yards. I routinely practice first shot hits on a golf ball the my 22 rimfire at 200 yards in “all” sorts of wind conditions..........it really helps with wind reading skills, which are transferable to LR centerfire work.

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Wind drift is about the ballistic coefficient and velocity which establishes the dwell time for the wind to drift the bullet. Weight is not the determinant. Just turns out that the heavy for caliber bullets generally have higher BC’s then the lighter bullets. A 300gr bullet from a 338 Lapua and a 140gr in a 6.5 Creedmoor, both staring out at 2800 FPS with identical BC’s will have comparable wind drift characteristics. I have experienced this with my shooting out 1000+ yards in a constant speed/direction of wind.

IMO, without sophisticated methods, it is virtually impossible to predict the exact effect of the wind for a given shot, particularly at the longer ranges. Lots of practice makes you better, but not perfect. I found an excellent practice method is shooting my precision 22LR from 50-300 yards. I shoot all year round going through several ‘bricks” of ammo with the particular goal of learning how to more accurately determine wind. My 22LR behaves very similarly to my centerfire with drop and wind drift calculations, accurately determined by a ballistic calculator. If you establish an accurate velocity and BC for the 22RF, it works perfectly in a ballistic rangefinder out to 300-400 yards. The difference is “range” scale. My rimfire at 200 yards with 10mph, 3’clock, wind has the same 6.5 MOA wind drift(and .5MOA accuracy), as my 6.5x47 Lapua at 1200 yards. I routinely practice first shot hits on a golf ball the my 22 rimfire at 200 yards in “all” sorts of wind conditions..........it really helps with wind reading skills, which are transferable to LR centerfire work.

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Actually it is basic physics. Assuming all being equal except weight, more force is required to move the heavier object the same distance. Of course all things are never equal but that was the proposition.