nikon M .223 scope

[Simon Brittan]

looking at buying a tikka t3 super varmint in .223 and using a nikon M223 scope, does twist rate of the barrel effect the rapid action turret adjustment at all

 

[OpticsPlanet]

Greetings,

Not sure exactly what you are asking. The twist rate has to do with bullet stability.

Are you asking if different twist rates would change the adjustment increments for the scope turret?

-Matt S.

 

[rbernie]

does twist rate of the barrel effect the rapid action turret adjustment at all

No.

Barrel twist rate is the rate of spin in the rifling (measured in barrel length/inches per complete revolution of the bullet), which affects the rate of spin in the bullet as it's fired. Heavier (longer) bullets need a faster (lower numeric, shorter barrel length needed to complete a single revolution of the bullet) twist.

Scope turrets are used to move the crosshairs of the scope such that the point of aim (POA) coincides with the point of impact (POI) at some chosen distance downrange. The bullet does not travel in a straight line but forms an arc, so some optics have multiple hash marks in the crosshairs (reticle) to allow the shooter to automatically compensate for targets at different distances. That feature depends on knowing the speed and aerodynamic efficiency of the bullet (as well as the distance to the target), but those factors are not really influenced by the rate of spin of the bullet.

 

[Simon Brittan]

These scopes are developed specifically for the trajectory of a 55 grain polymer tip bulletin mind , that's why I asked the question

 

[rbernie]

trajectory of a 55 grain polymer tip

The trajectory is not materially impacted by spin rate; it's mostly a function of wind, bullet air resistance/drag, and speed.

 

[bman940]

scope/bullet

Nikon's M-223 Rapid Action Turret scope is designed around a 55 grain bullet with a MV of 3240 fps. If you have that you will be ok. I have used mine to shoot soda cans at 600 yards.

Nikon does have this line of scopes under a Promo right now that will give you a free Mount when you purchase from an authorized dealer.

http://www.nikonpromo.com/mountup_2-15.php

 

[RainDodger]

rbernie is right - the bullet will drop at the same rate regardless of rotation speed. You should be good to go. After all... it's tough to alter the effect of gravity.

 

[fatal wound]

I have the Nikon M223 scope on my AR. Very happy with it. Once I got it sighted in 1/2 groups at 50.

 

[vurbano]

it doesnt matter. I have one. But if you are going to use their software etc based on 55gr projectile then I would get a barrel with a 1:9 twist which is optimal for stabilizing a 55gr bullet.