Originally Posted by bigngreen
It was my impression that Coriolis will have the same right component for any given direction but the vertical component changes with direction of fire.
I've found taking drift and Coriolis into account to be very beneficial for my wind calls now that I base it on what's actually going on not chasing "noise".
I believe you are correct.
In the northern hemisphere, the shift in POI due to coriolis will apparently be to the right regardless of whether you are shooting northbound or southbound. This seems counter-intuitive to me. But, here's my understanding...
When you face south, the gun and the bullet are travelling right to left which will "fling" the bullet to the left. However, the target to the south is closer to the equator and will travel from your right to left faster than the bullet is being "flung". Hence, you will end up hitting to the right of your POA.
Conversely when shooting north, the target will be moving from your left to right, but not as fast as the gun/bullet originating closer to the equator and thus being "flung" from left to right faster than the target is moving. As such, you will again hit to the right of your POA.
NOTE: The following 2 statements are incorrect as you'll see if you read subsequent posts...
Shooting westbound, the target will be closer on impact than it was when you squeezed the trigger. So, impact will be higher.
Conversely shooting eastbound, the target will be farther on impact than it was when you squeezed the trigger. So, impact will be lower.
Fortunately, we have computers and lots of gadgets to help us account for this. Whereas, I feel that spin drift may be somewhat more affected by the bullet and individual rifle. No doubt, everyone has an opinion about that.