@WeiserBucks commented on @Justin Crossley post about MOA vs Mils. It seems like the hunting community has favored MOA for a while now. Personally, I do not like to change things if they are not broken, but once I understood the wind formulas that can be utilized when shooting in mils, MOA was broken. I have posted a link below for the full article, but they mention a formula to get your gun value. What this does is shows you a quick formula for calculating wind calls on the fly. The article uses BC to calculate your rifle's wind number, but I simply use a ballistic calculator due to them being readily available and a little more accurate when making calculations. To do this you go into your ballistics calculator and set your range at 600 yards. Then you will set your wind angle at 270 and change the wind value until it shows a .6 correction at 600. Once you have done this you should have your rifle MPH.
For example, my 6 BRA is a 7 MPH rifle when pushing a 103 grain VT at 2850. So with that information I know that a 7mph wind at 400 yards is .4, 500 yards is .5, and 600 yards is a .6. With this information, I break it up in my head for 1/2 rifle number wind holds (sounds confusing I know) but what I mean is I can now do calculations for 3.5mph, 7 mph, 10.5mph, or 14 mph all very easily! In the field, you roll up onto your dream 220" mule deer at 500 yards. You do not have time to get your kestrel out. The wind is blowing so you predict the wind to be around 10mph. You know a 7mph would be a .5 wind hold so you multiply that by 1.5 for the 10 MPH and get a .75 wind hold. Now unless you are running a PR-2 reticle you do not have that hold so you quickly round to .7 or .8. At that distance, .1 mils is 1.8 inches so you are still well within the kill zone!
This method is quick and dirty but I have shot numerous PRS matches just estimating wind and using this formula and it works out very well! It also shows that squeezing out the last 100 FPS out of your 300 Weatherby has zero effect on "bucking the wind" no matter how much you would like to believe it!
I have tried breaking this down to be as simple as possible but if it seems a little confusing let me know and I can try to break it down a different way!
For example, my 6 BRA is a 7 MPH rifle when pushing a 103 grain VT at 2850. So with that information I know that a 7mph wind at 400 yards is .4, 500 yards is .5, and 600 yards is a .6. With this information, I break it up in my head for 1/2 rifle number wind holds (sounds confusing I know) but what I mean is I can now do calculations for 3.5mph, 7 mph, 10.5mph, or 14 mph all very easily! In the field, you roll up onto your dream 220" mule deer at 500 yards. You do not have time to get your kestrel out. The wind is blowing so you predict the wind to be around 10mph. You know a 7mph would be a .5 wind hold so you multiply that by 1.5 for the 10 MPH and get a .75 wind hold. Now unless you are running a PR-2 reticle you do not have that hold so you quickly round to .7 or .8. At that distance, .1 mils is 1.8 inches so you are still well within the kill zone!
This method is quick and dirty but I have shot numerous PRS matches just estimating wind and using this formula and it works out very well! It also shows that squeezing out the last 100 FPS out of your 300 Weatherby has zero effect on "bucking the wind" no matter how much you would like to believe it!
I have tried breaking this down to be as simple as possible but if it seems a little confusing let me know and I can try to break it down a different way!
Wind Wizardry: BC Wind Formula for Long Range Shooting
Read: Wind Wizardry: BC Wind Formula for Long Range Shooting from Sean Murphy on November 25, 2019 for Recoil.
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