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Timo

Member
Pedro & others!

In some post you Pedro mentioned that there are barrels what likes "green wind" and some "red wind".....

I know that this is not easy to answer.How big differences you have seen to wind drifting with barrels? Same brands or between different brands?

Maybe this must test inside range where are blowers giving same "wind" shot by shot and barrel from barrel.And then there is left how ammo is pushing to wind....

Some better on windy condititions and some in calm condititions?

Why I ask this?

Mr Mikko Mattila was/ is serious prone shooter and shooted 2 times 600/600 in competitions. He was also Olympic Medallist Juha Hirvis coach.Mikko told me LONG time ago that they changed to Juha different barrel to calm and windy condititions....

I asked this question from our 6 PPC World Champion and World Record holder Jari Laulumaa.When he is chambering 6-10 barrels same time and with test shooting try to find "best of the best".

He answered that there are maybe 2-3 mm wind drifting differences to 100 meter between barrels.

BR, Timo who is on "question age".
 
Timo, curiosity killed the cat... but curiosity means intelligence...
I do agree, we should be all on "question age". That's the way to progress.

Returning to your question, and I do expect some more knowledgeable people will join, I can only answer with results from my experience.
I don't have an indoor facility to test regularly and then with certain wind conditions. So, I can only dream on a such a thing...

In fact, there are barrels and barrels.

I think it's more a combination factor (bullet+riffling) than only a riffling aspect. I wrote riffling, and maybe I'm wrong, but for me, it's not the barrel brand or material, is more the riffling on it.
I remember when I shot 90 degrees side rifling on my Anschutz, the drift was way bigger than with a more shallow and rounded riffling like the ratchets, octagon, and others. So, I see it as an interaction between bullet rotation and air resistance on the riffling marks left on the bullet surface. We can see it as a car tyre pattern, some gave more grip than others. On the bullet side, more grip means more drift. The shallow and rounded riffling gives a more "slippery" surface to the air around the rotating bullet, so less drift.

Then, why some barrels like red wind, and some others green wind? That, for me is a mystery... and not really range dependent. Not being range dependent, it's not much wind dependent.
Just to give you an example, I have a barrel, that for the same wind speed, I aim for red winds, between the X and the 10 border, a bit high and left, of course, and, for green winds, I have to aim, in the middle 9 at 5 o'clock...
This is a much important barrel "key" that you should learn during practice.

However, this is also a brand/bullet pattern, because, lately, I've seen more and more green winds going down, against what's expected. And, to mix things, red winds not dropping. I don't see climate change introducing such a discrepancy, but this is happening.
 
Hello All from North Queensland Australia. I am new to this forum for participation. Have been watching it for quite some time.
To Pedro. I have seen over the past few years the change you see in Red and Green. On my home range years ago Red was the predominant flag, now it is Green.
Red was the predominant one before they started all this climate change stuff. Who knows what the cause is.
The only difference between your Red hold off and mine was that I had to hold about three times as much as you, but that depends on wind velocity.
Cheers,
Trevor.
 
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