Originally Posted by fatrack
I'm thinking about the Coriolis effect-
In regard to a shot along a North or South trajectory, my gut tells me the target would "move away" from the aim point faster than an East-West shot. I would even be inclined to think a East-West shot (small arms) should have negligible effect because the target is moving almost directly towards or away from the origin of fire.
Can you post a Coriolis correction for a shot fired either N-S at 45 latitude for comparison to the E-W correction you gave? Interesting stuff!
I thought the same until I spent days researching the topic.
Remember the input parameters here are the OP's 3000 fps MV, and a 200 gr Nosler Accubond bullet with an advertised G1-BC = 0.588.
At 45 degrees North Latitude, the rightward Coriolis Drift is 2.5" at 1000 yds no matter the direction of fire. The horizontal component of Coriolis drift is not dependent on the direction of horizontal fire. You can point your rifle N-S-E-W. NE-SW-NW-SE. The rightward bullet drift due to the Coriolis Effect is 2.5" over the first 1000 yds of bullet travel. Coriolis caused horizontal drift is dependent on Latitude of the shooter, being maximized at the poles and minimized to essentially zero for a shooter at the earth's equator.
Coriolis Drift also causes a vertical component of bullet drift, and the quantity of vertical drift IS
dependent on the direction of fire. Vertical drift is maximized with true East and true West directions of fire, and diminishes to zero when the direction of fire is true North or true South. In addition, vertical bullet drift is maximum at the earth's equator, and minimized to basically zero at both poles, even with the directions of fire being due East or due West.