Holding windage for practice

[Erussell01]

Me too brother. Me too.

You have identified a deficiency that would be greatly helped with a ffp mil based reticle.

The SWFA line of rifle scopes would be ideal for helping you overcome this deficiency.

If you are scared of the Fixed 10x. Consider the 3-9 or 3-15 powers. Unless you can find a fixed 6x.






Let me introduce you to the idea of a “wind number.” It lets you be generally in the ballpark of an accurate wind call based on what you are experiencing at the moment of the shot. If you can estimate the wind, and you know your distance, you can make a few rough estimations on how much windage to hold in a ffp reticle.

With Any ffp reticle, you can be reasonably sure that your bullet will drift at a constant rate if subjected to a constant wind. With a mil based ffp reticle, that constant rate of drift is most easily understood since we can break it down to .1mil increments. The bullet you are using will inform you how much it can be expected to drift. This rate of drift is generally defined as the wind number.
-G1 BC of chosen bullet, multiply by 10 roughly equals your “wind number.”
- so 73gr ELDM g1 of 0.398x10=3.98 3.98mph. So call it 4mph.
- This means: this bullet drifts about 0.1 mil for every 100yds in a 90deg 4mph wind. Also means it drifts 0.2mil for every 100yds in an 8mph wind. And 0.3mil/100yds in a 12mph wind…0.4mil/100yds in a 16mph wind…etc.

-So shot 1 is 187yds (roughly 200yds). 12-16mph wind (so with our wind number of 4mph, we can break these down into multiples of 3 and 4).
This means that the bullet is going to drift between .6 and .8 mils down wind at this distance. With our mil scope we can actually plot out the difference between these two points in the reticle as our error or uncertainty. Basically we can feel confident that the bullet will land in between these two hash marks. This has created a bracket we can stick on either side of our target to give us the most likely chance of hitting our target.
-Second shot is 405yds. Same wind? So 12-16 mph breaks down into wind number multiples of 3-4. So every 100yds we drift between .3 and .4 mils. A little multiplication tells us our wind bracket is between 1.2-1.6mil. Again hold into the wind and bracket the vitals in between our two goal posts.

Brother you just blew my mind

 

[43.6N]

Brother you just blew my mind

Wait till you learn about quick drop. It will make BDC reticles useless to you.

 

[PredatorX]

Yes Quick Wind is awesome.

Out of curiosity when you guys are holding for wind are you focusing on the center dot/crosshairs, the sub tension mark for wind hold or are you bracketing thus concentrating on the bracket itself?


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[43.6N]

Yes Quick Wind is awesome.

Out of curiosity when you guys are holding for wind are you focusing on the center dot/crosshairs, the sub tension mark for wind hold or are you bracketing thus concentrating on the bracket itself?


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Me personally, I consider all wind estimations to be exactly that: estimations.
I always consider the high estimate and low estimate.
If my bracket is larger than my vital zone target, that should tell me that I am too far away for a shot with the given wind estimate.

So long answer, but I’m focused on the bracket. Specifically how my target is fitting inside of it.