Re: .308 WIN Spindrift?
You guys are going to laugh at me for this but this is how I beat spin drift.
I first set my scope dead level to the rifle or as level as I can get it. I then take the load I will be using the most and dial it in perfectly at 300 yards. with the use of an external scope mounted bubble level. I then (this is the tricky part) find a day and location when and where there is NO wind whatso ever. I ussually reserve this for the coldest of days and early in the morning when there is typically no air movment where I like to shoot. Then I set up at the maximum distance I like to shoot. For me it is 1000 yards. I then (paying extra special attention top that bubble level) begin to shoot at the 1K line. Most of my loads from my 308 have been 8-10" to the right of center. Then I loosen the left side of my scope ring screw a tad and tighten the right side a bit. With a bit of patience you can ussually get the scope a rotate a tiny ity bitty bit off of true plumb. By leaving the bubble level alone and shooting by that the rifle is essentially canted every time you pull the trigger. Whether you use hold overs of dial the knob it brings it back in line. Complicated? Yes. Peace of mind? You betcha!
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.