I was watching a show I can't rember if it was on youtube or tv, however a man was showing the effects of corolis on poi. He shot 5 shots at 1000yds directly west that grouped 8" low and 5 shots at 1000yds directly east that gropped 3" high. I have never figured in corolis as I shoot 500-700yds and felt at that distance it didn't make much diffrence however, I have found that at one place I shoot(where I sighted in my rifle that i'm nailing it at 500yds and another place my shots are low at same range. This gentelman also stated that rifles should be centered either north or south but to my mind if you do that arent you just trading elevation for windage. What are yals thoughts on coriolis and at what distance do you consider it? Brad