wind deflection


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wind deflection

[′win di‚flek·shən]
(mechanics)
Deflection caused by the influence of wind on the course of a projectile in flight.
References in periodicals archive ?
The 7x57's 150-grain ELD-X bullet was just a step behind the 6.5 Creedmoor for both drop and wind deflection. Keep in mind this is a hunting bullet.
Such bullets shoot flatter, have less wind deflection, and carry more energy downrange.
The downrange difference here is much more minor, but a 7 percent gain in energy and a nearly 9 percent decrease in wind deflection can be important to some hunters--and it still goes to show that plastic tips do make a difference.
The 200-yard figures for energy, trajectory and wind deflection favor the Remington loading--hardly a surprise since that load employs a lighter, pointed bullet than the Federal ammo does.
Scientific or not I've drawn this conclusion; if .17 and .22 caliber bullets of similar form leave the muzzle at similar velocities, the differences in their trajectories and wind deflection wouldn't make a down payment on a cup of cold coffee.
The deciding factor in wind deflection -- and trajectory -- is time of flight.
As "guessy" as mirage-reading is, it's almost a scientific discipline compared to estimating range and wind deflection. Of the two, the former gets most of the ink in discussions such as this, but the effect of wind on a bullet is at least as important to a hunter, probably more so.
Many varmint shooters pick the .22s that produce the highest velocity for their reduced wind deflection and flatter shooting capabilities.
Yielding velocities over 2,000 fps, the new light bullets do better in wind than .22 LR and earlier WMR loadings that operated in the transonic velocity (slightly above and below the speed of sound), where the ride is bumpier and wind deflection at its worst.
.17 HMR Performance Distance (yd.) Muzzle 25 50 100 Velocity (fps) 2,550 2,373 2,205 1,893 Energy (ft.-lbs.) 245 213 183 135 Wind Deflection (in.) * 0 .2 .8 3.4 Trajectory (in.) ** -1.5 -.29 +.53 +.75 Distance (yd.) 150 200 Velocity (fps) 1,617 1,381 Energy (ft.-lbs.) 99 72 Wind Deflection (in.) * 8.1 15.4 Trajectory (in.) ** -1.47 -7.03 * 10 mph crosswind ** 125-yard zero; figures generated by Load From A Disk computer program.
The only guesswork will be estimating wind deflection.
Just as the trajectory of a bullet becomes steeper the farther it gets from the muzzle, wind deflection becomes greater at long range.