I have heard of spindrift and coriolis effect and figure you guys are the people to talk to. Are these really factors to deal with at 1000 yards or less?
spindrift??
- Thread starter rem sendero
- Start date
At what point do they become a factor?
Both of these should be very constant and will be accounted for when you sight in your scope.
If however you are trying to shoot records.
Spin Drift can however make your bullet more sensitive to some wind conditions. It will fight against the wind in one direction and travel with the wind in the other. If you spend enough time testing in the right conditions you may be able to identify how it effects the bullets fired with your loads in your gun and improve your groups. If you read Tony Boyers new book he briefly explains how to test for this.
Good luck.
If however you are trying to shoot records.
Spin Drift can however make your bullet more sensitive to some wind conditions. It will fight against the wind in one direction and travel with the wind in the other. If you spend enough time testing in the right conditions you may be able to identify how it effects the bullets fired with your loads in your gun and improve your groups. If you read Tony Boyers new book he briefly explains how to test for this.
Good luck.
Ok that kind of made sense, but what if you are shooting north west or south west or south east? what does that do for the Coriolis effect?
From http://www.appliedballisticsllc.com/index_files/SpinandCoriolisDrift.htm
Drift
"Having a left or right twist will change the direction of gyroscopic drift. Bullets fired from right twist barrels drift to the right, and vise versa by the same amount, typically 8-9 inches at1000 yards for small arms trajectories. "
Coriolis effect
"The Horizontal component depends on your latitude, which is how far you are above or below the equator. Maximum horizontal effect is at the poles, zero at the equator. The horizontal component doesn't depend on which direction you shoot. Typical horizontal Coriolis drift for a small arms trajectory fired near 45 degrees North Latitude is about 2.5-3.0 inches to the right at 1000 yards.
The Vertical component of the Coriolis effect depends on what direction you shoot, as well as where you are on the planet. Firing due North or South results in zero vertical deflection, firing East causes you to hit high, West causes you to hit low. The vertical component is at a maximum at the equator, and goes to zero at the poles. Typical vertical deflection at 45 degrees North (or South) latitude for a 1000 yard trajectory is the same as for the horizontal component: +2.5 to 3.0 inches (shooting east), or -2.5 to 3.0 inches when shooting west."
Drift
"Having a left or right twist will change the direction of gyroscopic drift. Bullets fired from right twist barrels drift to the right, and vise versa by the same amount, typically 8-9 inches at1000 yards for small arms trajectories. "
Coriolis effect
"The Horizontal component depends on your latitude, which is how far you are above or below the equator. Maximum horizontal effect is at the poles, zero at the equator. The horizontal component doesn't depend on which direction you shoot. Typical horizontal Coriolis drift for a small arms trajectory fired near 45 degrees North Latitude is about 2.5-3.0 inches to the right at 1000 yards.
The Vertical component of the Coriolis effect depends on what direction you shoot, as well as where you are on the planet. Firing due North or South results in zero vertical deflection, firing East causes you to hit high, West causes you to hit low. The vertical component is at a maximum at the equator, and goes to zero at the poles. Typical vertical deflection at 45 degrees North (or South) latitude for a 1000 yard trajectory is the same as for the horizontal component: +2.5 to 3.0 inches (shooting east), or -2.5 to 3.0 inches when shooting west."
Upgrades & Donations
This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.