Re: Spin drift and Coriolis at 1000+
Submoa, the way I think of it is that if a truck was coming at you or by you from the rising sun what would I do? Or the sun, which is really the effect. Shooting east, the sun is coming at you at high speed and hence bullet fall is less, shooting west it's going away, hence needs to go further, hence drops more. Similarly, shooting north or south the earth will have rotated westward, hence the bullet will be to the right of target shooting north but left if shooting south. At 1000 yds for me shooting north that is aboutb3" and add that to spindrift. At 2000 yds my spindrift is 1.4 moa. So, depends on the direction and where you are how big the effect is but as Broz said, at 1000 yds not huge. I ve tried to setup my scopes with a slight dip to the right so when level it cants to the left (1 minute on a watch face) and except for one rifle I don't seem to have gotten it right and then only at 1000yds. There was a discussion about this about a year ago. Bryans book is excellent in explaining this.