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Wind Calculations Brain Teaser

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Unread 03-21-2008, 02:47 PM
Gold Member
Join Date: Jan 2002
Location: Wenatchee, WA
Posts: 806
If you don't need to fire from the same gun... it's been said that a .22LR @ 200yds drifts in the wind about the same as a .308 / 155gr Palma load (which you are very nearly at) @ 1k, given the size of the targets and all. So you might take a look at your rimfire and spend some time shooting at 100-150yds with it, and really save some $$$.

Just a thought,

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Unread 03-21-2008, 02:56 PM
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Join Date: Jun 2005
Location: Yakima, Washington
Posts: 3,832
If you're talking same gun, same cartridge, same bullet just a greatly reduced powder charge to get the lower velocity I'd suggest that you be careful of shooting greatly reduced loads. I've never tried them and probably never will but there are some bad stories about results of shooting greatly reduced charges as compared to full loads.

Give it some thought and maybe post the gun, cartridge etc. and see if anyone on here has shot reduced loads of that level in their similar gun.;)
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Unread 03-22-2008, 10:33 PM
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Join Date: Dec 2007
Location: NC
Posts: 77
Thanks Milanuk,

I practice with my .22 alot. I guess I just need to use it for more than just trigger practice.

Thank you ss7mm as well. Here is what I'm using currently 13.5gr Red Dot in .30-06 Springfield (Remington Cases), CCI 200 primers, topped with 155gr Hornday A-Max. Shoots well in my Savage 110E.

Thank all you for your help.

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Unread 06-08-2009, 07:13 AM
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Join Date: Jun 2009
Posts: 12
Re: Wind Calculations Brain Teaser

Here is how it works: Gyroscopic Stabilization and Aerodynamic forces. You fire one round with at 3000fps and one at 1400fps, from let's say arbitrarily from a 1:12" Twist rate barrel. The bullets are rotating at different speeds (3000 rotations per second and 1400 rotations per second) and producing different induced forces (thing back to physics- that right hand rule, aerodynamics-wind cocking, spin induced yaw, etc). Time of flight may be the same for your scaled ranges but the forces are not. To get back to the induced forces... if I drop a bullet in the wind from a fourth story window it will impact on level ground the same time as if I fired a one level, but the wind drift will not be the same, it will be substantially less than the fired bullet (doesn't that stink). In those two or so seconds, the bullet is not being pushed by wind alone. Resisting forces increase (and not proportionally, but exponentially) with velocity. That is why your wind drift is different. Fluid dynamics are not directly scalable with size or velocity, so you've got a losing experiment for your purposes by retarding your load. Just like sex, nothing is like the real thing.
If you are interested in getting a reduced load for whatever purpose, go to a high volume powder like Trail Boss. With a lot of extra space left a case you risk detention vice the desire deflagration. Detenation is very bad and may cause catestrophic destruction of your rifle.
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Unread 06-09-2009, 01:19 AM
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Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 6,068
Re: Wind Calculations Brain Teaser

Originally Posted by edge View Post
IMO, no, but I have been wrong before

A .22 and a .511 bullet with the same BC certainly have a far different profile in the wind, and I would think that the 50 cal would be pushed further.

Only if they have a different velocity. There are only two things that affect wind resistance... BC and velocity... that's it... nothing else... Having said that, a 50 cal bullet will almost certainly have a greater BC than a .22 cal.

If a 22 cal bullet has the same BC and velocity as a 50 cal bullet. both will have identical trajectories, TOF's, down range velocities and wind deflections. Get your ballistics calc out and check it out.
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