Hatrick
Well-Known Member
The way I see it, the slower the bullet travels through the said distance the more moa it is moved. So as the bullet slows it is moved more. It travels in an arc to the target not a straight line.
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.
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.The way I see it, the slower the bullet travels through the said distance the more moa it is moved. So as the bullet slows it is moved more. It travels in an arc to the target not a straight line.
If one fires a .550 BC 6.5 bullet and a .550 BC .338 bullet will the .338 bullet be less affected by the wind?
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?
Use this free ballistics calculator and your question will be answered.
http://www.jbmballistics.com/cgi-bin/jbmtraj_drift-5.1.cgi
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).
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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