gamestalker
member
I really enjoy punching paper at distances out to 500 yds. with my high powered rifles. Is there a method of determining what amount of drift a cross wind will have on the bullet. An example of my average senario is shooting a 120 gr. V-Max bullet from a 7mm rem. mag with a MV of 3400 fps. at 500 yds. Often I'll be dealing with a breeze of 5-10 MPH. So for the sake of this question lets say thier is a steady 10 MPH cross wind, I'm shooting at 3000 feet elevation, the temparature is 90 degrees, humidity 10%. I'm not certain what the B.C. for this bullet is, but lets go with .390, I think that is pretty close for that bullet.
I've been hand loading and shooting like this for almost 3 decades and have heard different answers that vary greatly. So I thought I would ask in this site knowing someone will have a more specific, and scientific accurate answer.
My books indicate the above MV with a given BC takes about a half second to travel 500 yds. I can calculate my trajectory accurately, but I don't understand the drift from a cross wind. I obviously see that the cross wind effects my windage depending on the speed of the cross wind, I would just like some idea of how much the wind will change my point of impact. I think the element of this that has perplexed me is the short flight time of the bullet. And if I shorten the distance to say 200 yds. with the same MV, time of flight is far shorter. So even though once again I see some effect at just 200 yds., it just doesn't seem to be worth worrying about even with a 15-20 mph cross wind, or is it?
If someone can provide the average effect per mph, that would really appreciated. My Son has an electronic device that measurer's the wind speed, so I could easily calculate it's effect with your help.
I've been hand loading and shooting like this for almost 3 decades and have heard different answers that vary greatly. So I thought I would ask in this site knowing someone will have a more specific, and scientific accurate answer.
My books indicate the above MV with a given BC takes about a half second to travel 500 yds. I can calculate my trajectory accurately, but I don't understand the drift from a cross wind. I obviously see that the cross wind effects my windage depending on the speed of the cross wind, I would just like some idea of how much the wind will change my point of impact. I think the element of this that has perplexed me is the short flight time of the bullet. And if I shorten the distance to say 200 yds. with the same MV, time of flight is far shorter. So even though once again I see some effect at just 200 yds., it just doesn't seem to be worth worrying about even with a 15-20 mph cross wind, or is it?
If someone can provide the average effect per mph, that would really appreciated. My Son has an electronic device that measurer's the wind speed, so I could easily calculate it's effect with your help.