"Proper" .308 grain?? Bear with me.

[dee]

No offense taken. I was the same way when I first heard it. I'm still kinda on the fence about it kinda, at least the full on science side. I have had it happen though so I can't doubt it too much.

 

[Younggun]

I see the stability side, I knew bullets would tilt and yaw on their axis after leaving the barrel, but I never knew about the nutation (learned a new word).

 

[azkcr]

Aaaah. Back over here at a gun thread instead of the other one I started. It's a $}{!T storm over there... Lol

I digress, so what yardage would one start to take coreolus affect and the crosswind climb/fall into consideration?

 

[TundraWookiee]

Aaaah. Back over here at a gun thread instead of the other one I started. It's a $}{!T storm over there... Lol

I digress, so what yardage would one start to take coreolus affect and the crosswind climb/fall into consideration?

Depends on your location, azimuth, and bullet flight time. Coriolis drift isn't an aerodynamic effect so there are many variables.

 

[Younggun]

I punched it in to my ballistic app and it didn't seem like something I would ever be likely to worry about. Something in the area of 1/4" at 1000 yards.

I can see it mattering in a competition that can be won or lost by MMs, but not for anything I plan to do.

 

[azkcr]

^
Check. Coriolus won't even be considered anytime soon. Probably ever.
Only thing I'm concerned with is the amount of wind we get here. It blew +30mph sustained all day today.
That'll mess with it pretty badly I imagine.
I just need to get that app. But I don't have an iPhone.

 

[Younggun]

Try the others recommended. It's nothin more than a mathematic equation. The others probably work just as well, I just got used to this one and really like it. I'm sure they feel the same a out what they're using.

 

[dee]

You can use jbm.com for an online option. It even has Litz bc options to get a pretty close drop sheet before hitting the range.