Thread: Whats the difference

Dialing in .250 moa left for 500 yrds and .5 moa left for 1000 yrds will negate 90% of the right hand drift effect of spin drift at those distances.

The total effect of spin drift is a combined effort of a few factors including but not restricted to projectile length, surface area, rpm and air density, the total amount of spin drift experienced often being as variable as the various projectiles used.

Coriolis has a 4 directional effect on your projectiles point of impact depending on your projectiles flight path in relation to the earths rotation and in certain situations can cancel out the effects of spin drift, and in others exaggerate it.

And just to make matters even more interesting on the day the wind currents, eddies and subtle breezes you experience at your private range can often affect your shot more than either of these two conditions.

trivia, the pommies made their 303 in left & right handed rifling, the reason for this from what I'm to understand was the effect of coriolis. And the direction that they would be firing. Someone may be able to expand on this?
Cheers Rob

Originally Posted by 7mmsaum

Dialing in .250 moa left for 500 yrds and .5 moa left for 1000 yrds will negate 90% of the right hand drift effect of spin drift at those distances.

The total effect of spin drift is a combined effort of a few factors including but not restricted to projectile length, surface area, rpm and air density, the total amount of spin drift experienced often being as variable as the various projectiles used.

Coriolis has a 4 directional effect on your projectiles point of impact depending on your projectiles flight path in relation to the earths rotation and in certain situations can cancel out the effects of spin drift, and in others exaggerate it.

And just to make matters even more interesting on the day the wind currents, eddies and subtle breezes you experience at your private range can often affect your shot more than either of these two conditions.