Home Forums Hunting & Shooting Ask The Gunwriters .270 trajectory from treestand?

OK, here's the formula in Speer's reloading manual for determining wind drift.

DRIFT r = Vw X [TOF - R/Vm]

DRIFT r, the r = range. Vw is the velocity of the wind. TOF is the Time Of Flight, or exposure time. R is again Range, which is divided by Vm, or muzzle velocity.

TOF is in fractions of a second, to a given Range in feet, and as I said Vw is wind velocity in feet per second. Vm is the muzzle velocity in FPS.

Your result will be in feet...divide by 12 and you'll get the answer in inches or fractions of inches.

So, you're saying the drift of the bullet would be the same in a 30 MPH wind as it would be in a 5 MPH wind (full value?) Any fool knows that's not true.

The definition of ballistic coefficient is the weight of the bullet in pounds divided by the square of its caliber in inches, and by a factor related to the shape of the bullet (which I don't know...gotta look it up.) It's also meaured at different velocities, but basically, the static BC of a bullet gives you all the information you need, in most cases.

You know that is not what I said (speaking of fools). A bullet would turn furthur into a higher speed wind and more of the drag would be down wind. If you didn't like the 22 bullet droping try this. Please read it before you reply.
Consuder an aeroplane flying in a gross wind. The pilot steers into the wind to maintain course. In this case the downwind drag that the bullet would see is balanced out by the thrust of the prop.
Take Care!

Most bullets don't have pilots, and most airplanes without pilot action would be blown grossly off course. And bullets, unlike airplanes, don't have the ability to speed up in the face of the wind. There's simply no comparison between airplanes and bullets.

I can't see how you fail to grasp the simple concept that wind will move a bullet. For a bullet to do as you say, it would have to yaw, and wouldn't enter the target cleanly, but keyhole.

Can't see how, when a formula is offered from a reputable source, you can't accept the facts.

I was trying to help you grasp the concepr of resolving vectors into two forces.
You Win!

I was trying to help you grasp the concept of resolving vectors into two forces.
You Win!

Sorry, hawkins. You're intelligent and probaby a good mathematician, but "two vectors" doesn't seem to apply to bullets.

In fact, I don't think (as a poor mathamatician, that any object can go in two directions at the same time.

You're overthinking...put the crosshairs on it, and squeeze it off.

If you were 40ft up a tree with a bow and a deer at 30 yards, you might have to adjust. 20ft up and a .270 is no problem.