So I wonder if anyone has checked these effects with a no wind 0 at 100 yards and then been able to see the 1 MOA difference at 1000 yards. My shooting is done at 34 Degrees North Lat. I also shoot in a northerly direction. My rifles save 1 have a right hand twist. Will have to see if there is less effect between the two. This question just asks about horizontal and not vertical. Many will notice this question is prompted by Bryan L. and his excellent articles.