If you want to know calculated wind drift correction at long ranges of 200 to 600 yards you need accurate data from a chronograph and an on-line ballistic calculator such as the JBM Ballistics calculator at www.jbmballistics.com. Go to trajectory data input.
Here is a wind table I have created of wind correction in inches needed to be on a 6 inch target if the rifle was zeroed at 250 yards with a BC of 0.489 and bullet muzzle velocity of 2950 fps. To the left is wind speed and to the right is the wind correction needed to keep the bullet on target at distances out to 600 yards.
At the bottom of the table is the bullet drop as it is affected by gravity. This table now needs to be proven at the ranges and corrected as needed for real world data. I interpret that at wind speeds of 5 mph or less that you can shoot all the way out to 294 yards as the True Max Point Blank Range without need to compensate for gravity to stay in a 6 inch circle. At 400 yards the bullet will drop at the same rate 32 feet per second per second no matter what the wind does and will drop 15 inches (in yellow) based on its ballistic coefficient (wind drag) or you can compensate by turning your vertical adjustment up 3.5 MOA.
Tools:
Chronograph (cost 80 to 120 dollars)
A Camera stand that can connect to the Chronograph base
Data of Ballistic Coefficient for your bullet
A Ballistic Calculator such as www.jbmballistics.com
Once you shoot your rifle to get data for your bullet speed using the chronograph, In theory many serious hobby ballistician’s use the 6 inch circle as the ideal target bullseye of the heart lungs of a whitetail deer when plugging in data to the calculator. Some will use 8 inches for Elk heart and lungs. The lungs of a deer are laterally longer than 6 inches but you get the idea. So you have a little print out of this field tested data on your stand. You note a buck is standing at 500 yards facing left and the wind is blowing right to left at 10 mph where should you aim? I mean if you are practiced at this. Laterally you should aim around 17 inches to right of the lungs just forward of the rear ham muscle and adjust your vertical height on the scope accordingly to compensate for the 33 inch drop which is 6.4 MOA. This kind of shot needs to be practiced in training to be sure of the shot. If you have not practiced this kind of shot then let the deer walk away. Perhaps another day he will be at 100 yards, right? It is about the ethics, a clean kill and training.
This table does give me confidence in a 300 yard scenario if my rifle is correctly supported and the wind is 5 mph or less as it is often at dawn. © 2015