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> Wind deflection
Wind deflection
@ 11:23 am (GMT) |
Scott StruifFor normal range hunting (<= 400 yards), a crosswind will have most of its effect in the first 100 yards. So there’s no need to stress over what the leaves are doing at 200, 300, and 400 yards. Just determine the wind speed where you are.Also, if you’re shooting across flat ground, and you’re shooting prone or otherwise close to the top of vegetation, the effect of crosswind will be minimal due to turbulence. https://youtu.be/9n0u981umgE |
Replies
@ 08:27 am (GMT) |
VinceRe: Wind deflectionHi Scott,Thanks for posting that was an interesting watch. I have wondered how much value a kestrel type device actually has when shooting longer distance, based on this I can see the point to them. Also curious to know if the gyroscopic stability explanation is where the "bullet goes to sleep down range" thing comes from. Technically true but it doesn't make your groups shrink further out! Cheers Vince |
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@ 09:55 am (GMT) |
Scott StruifRe: Wind deflectionHi Vince. I’m sticking with Nathan’s wind speed estimation method on p. 221 of the LR Shooting book. And yeah, that myth of shrinking groups is BS. If I were going to shoot long bullets in a slow twist rifle, I’d test them at long range, just like any other bullet. But I’d review the video also. My rifle range is several thousand feet below where I hunt. It seems like higher air density would magnify the effect of instability, but there was a lot to absorb in that video. |
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@ 06:49 pm (GMT) |
VinceRe: Wind deflectionHi Scott,Yes, you can accumulate to much crap in this game just like any other, I wouldn't want to carry one in the field but can see the point of borrowing one when zeroing a rifle to have an accurate data set to have as a base line. I managed to listen to all 3 podcasts today travelling to and from the river for some fishing, wow there is some complexity to the different forces in play on a projectile! Makes you wonder how anyone shoots sub moa although they did say most of the effects were tiny increments that they exaggerated to explain the effect. Was interesting hearing about the Magnus effect on some bullets when they go transonic, apparently rare in centrefire projectiles as I've been watching a few utube videos on .22 lr shooting out to 500 yards and it looks to be what happens when they try with supersonic bullets, the subs are far more predictable. Amazing listening to the explanation of wind influence and where it has the greatest effects on impact down range, I couldn't make sense of the statement until I listened, then it made perfect sense! I'm not so sure about your minimal wind effect when shooting close to the ground statement, the message I heard was that the higher you go the greater the wind was likely to be, but they were talking significant height not within 100 metres of the ground. I'll have to go back and listen again to be sure, but thanks again for posting, well worth a listen. Cheers Vince |
@ 11:18 pm (GMT) |
Lane SalvatoRe: Wind deflectionI like going and shooting in the wind at the range. We are lucky at being unlucky and locally there is never a week when shooting in a stiff wind isn't possible. |
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@ 08:41 am (GMT) |
Scott StruifRe: Wind deflectionSounds like good practice, Lane.Starting about 43:00 the Hornady guy talks about “wind gradient.” I did a little further reading about it. It’s a phenomenon caused by shear force and turbulence that occurs when wind contacts the ground and structures on the ground such as vegetation. Higher up off the ground, wind speed is higher and more constant because there’s noting to break it up. On a cross-canyon shot, the wind will deflect the bullet more than on a shot that travels low to the ground. Say you’re shooting at 400 yards. You notice the branches in a large tree moving, and determine it’s a 10 mph crosswind. If you’re shooting cross-canyon with a .350 BC bullet, the wind deflection will be 16 inches. On a small deer standing broadside with the wind behind him, that means aiming at the gut. If you’re shooting over flat ground with vegetation, you might want to aim at the liver. |
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