The UK's Finest Independent Forum for Shooters and Gun Owners. Est 2010.

ovenpaa wrote:The other thing to consider is the projectile will endeavour to turn itself directly into the wind, this does not mean it will turn left when confronted with a wind from 9 O'clock but it does mean the forward most part of the projectile (Notice I have not used the word head) will cant in that direction. This should not significantly impact shooting at 100x but will at 1000x

when you stop and think, thats obvious, but I would have never thought of it...

Ofcourse the projectile will try and find the path of least resistance, and that'd be pointy end into the wind and facing the way its going...

how would that effect the 1000x?

Also, if it turns too much into the wind, is that when projectiles can start to tumble.... i cant help but think the spin helps cause this...

another thing someone told me, and i don't know how true it is is that the bullets go round like this (see attachment)....

I'd imagine its possible due to the spin, but surely it wouldnt be accurate if it did this? obviously I've exagerated it in this picture as it might not be noticable at 100 yards, but over 1000 yards, would a bullet spiral like this?

You will love Litz book, he talks about this but in short it is not something that we need worry about, Litz says,

"Wind deflection might be between 05 and 10 feet for two consecutive long range shots, but spin drift will aways be the same for a given bullet/velocity/spin rate at that range"

So as long as nothing changes your bullets should all go through the same hole, not trike the target at any place in a spiral pattern,

DM

Dangermouse wrote:You will love Litz book, he talks about this but in short it is not something that we need worry about, Litz says,

"Wind deflection might be between 05 and 10 feet for two consecutive long range shots, but spin drift will aways be the same for a given bullet/velocity/spin rate at that range"

So as long as nothing changes your bullets should all go through the same hole, not trike the target at any place in a spiral pattern,

DM

thats what i was thinking to be honest, it might spiral, but the spiral will happen ove rthe same distance, so long as you zero first then the zero remains constant regardless of the spiral.

if only i could draw in 3d!!

Ovenpaa, what was that program you were using?

That is an Alpha version of the Pejsa model for ultra high BC bullets I am looking at with someone else, it has a lot of changes made and is not really suitable for this.

No, I meant that drawing program you were using...

Google Sketchup.

TattooedGun wrote:So my gf was asking whilst we were on SS on saturday if the wind at 100 yards made a difference..

Both me and her mom said at 100 yards not really...

I frequently see shooters trying to shoot groups at 100 yards and coming out with the most feeble excuses for their miserable attempts - but they never blame the wind!

Remember the benchrester's adage: 'Any wind moves any bullet at any range'.

If you want to make sense of your 100 yard load testing, get some wind-flags. A streamer on a stick is better than nothing.

Vince

Gun Pimp wrote:

TattooedGun wrote:So my gf was asking whilst we were on SS on saturday if the wind at 100 yards made a difference..

Both me and her mom said at 100 yards not really...

I frequently see shooters trying to shoot groups at 100 yards and coming out with the most feeble excuses for their miserable attempts - but they never blame the wind!

Remember the benchrester's adage: 'Any wind moves any bullet at any range'.

If you want to make sense of your 100 yard load testing, get some wind-flags. A streamer on a stick is better than nothing.

Vince

haha, I'm all out of feeble excuses... I used them all last time i was in a competition

the tiny sight picture was our main disadvantage really... I was wondering about the wind, as I didnt really know... i thought something getting to its target in a spli second didnt really get exposed to wind long enough to make a practical difference, but i was wrong :)

and its nice to be wrong, because it means that by being put right, i learned something :)

Days without wind are few and very far between and can be as confusing to shoot in as say a 10mph wind. we memorably shot in a valley at just over 600m in Denmark last year when for about an hour what had been a gentle breeze stopped. Nothing, not a whisper with a temperature in the high teens. A time to confirm true zero and shoot for groups. In that brief period I experienced the true accuracy of a modern rifle as did Christel. Next morning normality was resumed and I could compare groups, even with a high BC bullets moving at high MV's there was a difference.