How critical is scope level?

[FURMAN]

If you want to find the exact error you would take the cosign of the angle of cant using the amount you have clicked up as the hypotenuse. This would give you the true amount of elevation. You could also use trig to find the horizontal displacement.

 

[Rifleman97]

I'll jump in... bullet coriolis! If you have a RIGHT twist barrel which way would you twist the scope to account for the coriolis of the bullet ; clockwise or counter clockwise ?

Kindof off topic for this thread since it's about ballistics instead of cant of the scope but right twist barrels lead the projectile to go right, therefor you would adjust the scope accordingly, to move POI to the left.

 

[bgbuck153]

I don't think it's that far off topic. Life goes on

 

[CMRHG]

I don't think it's that far off topic. Life goes on

I know how much my spin drift is but not looking to compensate for it with the scope. Just wanted an idea of how cant equates to left or right impacts and to be able to emphasize to my clients how its very critical to set your scope up properly.

 

[CMRHG]

And it does impact vertically as well...

 

[Muddyboots]

So do I want a right hand spin in the northern hemisphere and a left hand spin int he southern hemisphere to offset earth rotational spin?

 

[jimbires]

here is an article on rifle canting .

https://www.longrangehunting.com/articles/how-canting-your-rifle-affects-long-range-accuracy.124/

 

[SilentPew]

Here's the formula
A(.0175)(x°)
Where A is the amount of drop at the range you're shooting at and X is the angle in degrees your scope is tilted.
So it would be
232(.0175)(1)
4.06"

205(.0175) (1)
3.58"

This is awesome, thank you for sharing. Will use this to illustrate importance to my customers during the mount and bore sight process.

 

[RockyMtnMT]

I will say this. I shoot much better with a level.

 

[dfanonymous]

Depending on the degree of can't it can open your groups up at 100y/m a few inches. -/+ 2 degrees may not be the end of the world. However at longer distances it will throw you off vertically and horizontally.

 

[WildRose]

not needed.

 

[RockyMtnMT]

not needed.

Explain

 

[WildRose]

Explain

He already caught it.

 

[RockyMtnMT]

He already caught it.

I guess I'm slow. Are you saying a level is not necessary?