Finding your Rifle Wind Number

[@caseygavazzi6220]

Thank you for the explanation very easy to follow and understand.

[@matthewsolo5162]

Glad it was helpful!

[@toddb930]

Thank You for the excellent explanation! I've struggled trying to understand "gun number" but you explained it so well.

[@matthewsolo5162]

Awesome! I try to keep things as simple as possible, because it can very easily get complicated when trying to break down some of these topics.

[@Sw00per_actual]

Good simple explanation.

[@matthewsolo5162]

Thank you for taking the time to watch I appreciate that very much!

[@jeffhunter3402]

Cool, glad i found this!

[@matthewsolo5162]

I hope it helps you out!

[@championdefense811]

Very helpful. Thank you.

[@matthewsolo5162]

Glad it was helpful!

[@davidwilliams299]

Great lesson now I get it. Can you do some more examples of how to apply it to different wind speeds and distance distance. Thanks

[@matthewsolo5162]

Absolutely! Sorry for the delay, I will try to get around to it this weekend, work and life has been taking all my time first half of the year, things finally slowed down, so I am trying to play catch up with the content.

[@cs7285]

Thank you for this

[@matthewsolo5162]

My pleasure!

[@sambenge9140]

I use something similar. Smart man

[@matthewsolo5162]

I would be interested to hear what technique you use, always looking for new ways to teach my students or even find a potentially better way to do something myself.. Would be awesome if you broke down your technique here in the comments if you wouldn’t mind.

[@rod8429]

Thanks for this info dude 👍🏼

[@matthewsolo5162]

Any time!

[@chrisdewet4384]

My numbers does not add up at all. Using 4dof too...308 Example....at 300 meter...3 mph wind = wind drift 0.57. At 300m with a 4 mph wind....it jumps to 0. 75. My point.....I can not find my gun wind number...

[@matthewsolo5162]

@chrisdewet4384 what is you muzzle velocity?

[@chrisdewet4384]

@@matthewsolo5162 It is 1860fps

[@matthewsolo5162]

@@chrisdewet4384 okay I just changed my muzzle velocity to that and set wind to 90° at 3mph and it lined up correctly. 100m - 0.09, 200m - 0.19, 300m - 0.30, 400m - 0.42, 500m - 0.55, 600m - 0.68 So obviously rounding to the nearest 10th, your gun number is 3 mph out to 400m then it bumps up +.1 at 500m, so I’d assume it works out to 450m Make sure you look at the wind only column not total wind. The total wind column will be different cause it accommodates spin drift, and depending on which direction the wind is input from it will give you two completely different numbers.

[@swordmage12]

Is this the same for MOA shooters? I’m new to precision shooting and my first scope is in MOA. I think I’ll be switching to MRAD once I get the money to get a new scope😅😅

[@matthewsolo5162]

Yes it is, but you have to do it slightly different. Depending on the increments your scope adjusts per click for windage is the goal. For example if you have 1/2 minute clicks, then you wanna do this same process and find where you numbers line up so you can make the clicks match. Wind in mph - 100yd- 1 click - 1/2 minute 200yd - 2 clicks - 1 minute 300yd - 3 clicks - 1.5 minute Etc.. Let me know if that doesn’t help, I can break down again differently if needed.

[@charlesludwig9173]

Use MOA wind constant formula. Example M118LR at 2610 uses an MOA wind constant of 10 at 1000 yards so if you have a 5 mph cross wind the formula works out like this: 1000 yards divided by 100 equals 10 times 5 mph equals 50 divided by constant of 10 equals 5 MOA and that’s the adjustment you take on windage control or the hold you take on MOA scaled reticle. This is what USAMU teaches SDM students.

[@caseygavazzi6220]

I tried to use this method in the geo ballistics app. My data was correct(I think). I tried for 6.5 CM data and .300 WM data. Both yielded results that seem a little high to me. 20mph and 13 Mph for gun numbers respectively. What other inputs might I check to see if I entered all the data correct?

[@matthewsolo5162]

Since I can’t physically see your solver screen. I would check. MV being input correctly Twist rate input correctly Direction of wind full value (9/3 o’clock) Make sure you are looking at only wind no spin drift included. Make sure direction of fire is at 12 o’clock

[@cpage305]

2714 with a 175 gr 308! How long is your barrel?

[@matthewsolo5162]

24” proof research

[@charlesludwig9173]

@@matthewsolo5162something is off here. Your velocity should be 2610 fps.

[@matthewsolo5162]

@@charlesludwig9173 Why would it be 2610?

[@jeremiahpjones7467]

lol that’s funny

[@matthewsolo5162]

I’m lost what’s funny?

[@LifeisGood-ye8rl]

How do you get your rifle to shoots 175 grain 308 round to be 2700s fps? Mine is 24 inch 5 r barre and it only managed 168 smk federal god match 2635

[@matthewsolo5162]

When i shoot 168 grain my FPS is around the same as yours. The bullet having 7 more grains is what is pushing that velocity up to the higher bracket.

[@wi4203]

Not all loads are created equal. It may be that your using a slower burning powder or a suboptimal charge weight in your load. Try different ammo. AB39 out of my 22” barrel can be anywhere from 2630 to 2700 depending on the lot. Ultimately that extra 65fps isn’t going to make or break you for most applications anyway. Compare your data at mid range and I think you’ll be pleased to find that your probably no more than .2-.3 mil of difference between those two velocities at 500 meters.

[@matthewsolo5162]

That is true, which is why we typically try to keep lots and sub lots together when running factory ammo. Since we do not have the luxury of controlling all the variables like a hand loader. Typically that helps with consistency from what I’ve seen.

[@EChunter]

Doesnt really work with minutes does it .

[@matthewsolo5162]

@@EChunter it does!!! I have a video for that as well. kzbin.info/www/bejne/ppa1iJRodr-Yf8Usi=QhiSSbK5OcXvvLUI Not sure you can click here but if you scroll through my stuff it’s just for MIS users.

[@EChunter]

@matthewsolo5162 ok thanks, appreciated!

[@cecilandrews7479]

Reading the win takes a lot of practice. And a hell of a lot of luck. A top quality rifle in cartridge in the hands of an average shooter. We'll still be About a one inch group or bigger. A 3mph wind, They will never. Notice a group change. The last several years everybody and their brother seemed to call themselves a sniper. The funny part is.People don't even know what the term snipper means. The military trains expert marksman not snippers. The long range precision shooters of today would make these people look like kids with b b guns

[@matthewsolo5162]

Agreed, that's why we have to constantly practice. Most people cannot out-shoot their rifles, but that will be the first thing they blame for missing! It's surprising how many people don't realize how much work it takes to be a true professional, and that goes for a lot of different topics, not just shooting.

[@mark-rk3pr]

it only works if you turn off real world effects (physics--spin drift).. you cant turn off physics when actually shooting. do the math with a 90 degree wind and its off with a 270 degree wind

[@matthewsolo5162]

That is only half correct, find the gun number without your skin drift is how you find your wind number pure. If you know you have a right hand twist and a 270°/left to right wind, depending on your caliber/muzzle velocity you can determine when it changes for example. My 6.5 cm doesn’t become a .1 deviation until 500 yds which is 5cm which is 1.9 inches. Which isn’t significant enough for most people to outshoot. And again this is a guess so it won’t be perfect. Now if you had a left hand twist rifle this entire situation would be in reverse, so it’s important to know the details of your rifle & bullets performance to know when to make the accurate adjustment.

[@mark-rk3pr]

it is 100% correct ..do the math at 90 degree wind and it does not work for 270 degree wind. your reply does not address what i am saying

[@matthewsolo5162]

@mark-rk3pr nope you’re right I apologize, but in the video and written on the board I address in the video @2:38 turning off spin drift… If you keep spin drift on my previous reply references what spin drift adds. I should have read that more carefully the first time I apologize. Either way it’s a technique you don’t have to use it, if you have something better that works for you I’d love to hear it, always looking for new ways to do things. This technique works for me quite effectively so I have implemented and continued to use it for years.

[@charlesludwig9173]

Gee, you’re making it too hard. Just use MOA wind constant for your loading. Example: for cartridge with MOA constant of 10 at distance, distance in yards divided by 100 times wind value in mph divided by constant.

[@matthewsolo5162]

You are correct if you are using MOA, I use mils, so this is easier in my opinion. Also I think it just depends on what resonates with each person, honestly this makes more sense in my brain, and I have also trained to this for close to 10 years, not discounting your method, I've just never used that before so I don't have a good baseline for comparison.