Re: reading wind?
Here's a pretty simple formula I use for fast calculations:
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
(range in yards/100) * wind (mph)
wind hold(mils) = ----------------------------------
constant
</pre></div></div>
The constants I use are:
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
Range(yards) Constant
<= 500 45
600 43
700 41
800 39
900 38
1000 37
</pre></div></div>
However, that's a rough approximation for my load. If you want one more accurate, use a ballistic program set up for your load and a 1 mph full-value crosswind, and work the formula backwards:
<div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre>
(range in yards/100) * wind (mph)
constant = ----------------------------------
wind hold(mils)
</pre></div></div>
But you can use a ballistics program and Excel to build a windcard like this one, which you can quickly use in the field to calculate the effects of varying wind - the wind holds are in mils: