Home Forums Hunting & Shooting Long Range Hunting Wind!

I think quadratics are a little bit beyond your capabilities.

Use a ballistics app.

antelope_sniper,



But someone post a name "Jeff Hoffman" and I googled it. There is a formula!

You are correct, I think. I never heard of quadratics before. But then one time a guy at work told me I was using algebra to solve for some unknowns. I din't know what I was doing was called algebra. I just knew it worked. Maybe quadratics is something in the formula.

This is one of the reasons MOA has an edge over Mils.

Basic wind formula for 10 mph is Range/200.

Example: .243 Win/105gr VLD/3075fps

Western hunting. 7000 ft 30 degrees.

G1 BC 0.54 @ 3075 fps.

500 yds 10 mph crosswind: 500/200= 2.5 MOA of drift

1000 yds 10 mph crosswind: 1000/200 = 5 MOA of drift

Off the basic we get to simple modifiers.

My .264 Win is just as simple for a 10 mph.

Range / 200 and then minus 1 MOA

500 yd 10 crosswind: 500/200-1= 1.5 MOA

1000 yd 10 mph crosswind: 1000/200-1 = 4 MOA

I could go on but the MOA subtension is better matched for shooting than the Mil.

Just one of the advantages to MOA reticles.

Now THAT'S what I'm talkin' about! Go John!

Speed/direction seems a bigger trick than the physics. Piles of 75 Amax doesn't hurt either.

Yep. 6 mph gives me .1 mil per 100 out to 600 with my 6.5x47's favorite load.

John

Unless you can figure out exactly what the wind is doing at the muzzle, at the target, and several increments in between it's just an educated guess, no matter who you are, and often enough they do not.

THATS WHAT I''M TALKING ABOUT!!!


The spray tan bizzzz sun!



Clark

I see no advantage of MOA over MIL one tenth of a Mil is extremely close to 1/3 MOA. 3 tenths extremely close to 1 MOA. Certainly close enough.

So you memorize your drop numbers and calculate drift in your head?

Are you spinning turrets or using the reticle?

That is the problem with wind, there are no absolutes and you cant set up wind flags to the target. get a good ballistic program,use the highest B.C.bullets and get lots of practice is the best formula I can come up with. there are times when Mother Nature just wins

I'm thinking knowing the wind at the target and even close to the target is not necessary; unless it's a gale. By the time the bullet is within about a 100 yards of the target it will not move more than a 1" in a ten mile an hour wind.

Thoughts?

If you don't constrain the range of the shot that's incorrect on both counts in that even a good bullet will drift more than an inch in the final hundred yards with a 10 mph crosswind and the effect of wind is greater the farther you get from the muzzle.

PS, with a smart phone and an app, you can demonstrate this to yourself pretty quickly for any rifle and load you shoot.

smokepole,



First let me say, I think you are making a sale here. For conversation's sake....

Without looking at a computer drift chart I have a question. Let's say there is no wind after the first 100 yards of a 1000 yard shot. Wouldn't the bullet continue on its errant path from the first 100 yards at the angle it was deflected?

No. Spin Drift.

The bullet is pushed off course by the wind, the wind stops pushing and the bullet stops be pushed off course.

I've read Bryan Litz's explanation and technically, I believe it's incorrect to say the bullet is pushed off course by the wind. I believe the wind causes the bullet to alter its orientation and that's what causes the deflection. I think I've read MD say something similar, maybe he'll chime in.

Ringman, I wish I could answer your question. That would mean I had a really good grasp of all this.

Exactly...

The wind doesn't push the bullet. The bullet nose points into the wind causing the bullet to drift with the wind.

Some interesting thoughts here.....








Ummm. Care to elaborate...?

Once that bullet is drifting off course from a wind influence, it will continue to drift to some degree, even if the bullet is no longer being pushed by that initial wind.

It's mass in motion. Kind of like a vehicle doesn't immediately stop if power is lost.

Now try to read and calculate multiple wind influences along the bullet path. Different directions, different speeds, updrafts, downdrafts...

The complexity of long range wind reading is no joke. There is a lot of art to it, and I don't think anyone can really master it completely.

I enjoy the difficulty. It's part of what keeps it all interesting and challenging.