Lr-fc target confusion

[Twdmar]

There is a locked thread about a LR-fc target for long range f-class. The confusion i believe revolved around actual dimensions of the target and of the mil grid placed over the bull.
The x-ring of the long range f class target is 1/2 moa or 5". The decimal difference is not worth noting. Since a mil is about 1/3 of moa, again approximately, the x ring is then like .15-ish mrad.
Some Highpower shooters use a concept that corrections should be less than the actual distance from the center of the target to a bullet hole. This comes from the idea that most rifles are not lasers and shoot more of a pattern than a single hole. Following that logic, if the bullet hole is 1/2 moa from the center and the sights are corrected 1/2 moa, some fraction of the following shots will land in the center, but some fraction will land outside, an over correction. So, if your sights will do it, correct 1/4 and you will get less over correction shots going out the opposite side.
With a mrad scope, .1mrad will stay in this 1/2moa x-ring, along the edge perhaps, but .2mrad is too much. The grid overlay is a cheat sheet for a shooter to keep track on an moa target with an mrad scope. Usually this is something beginners will rely on more. This picture i am posting has a grid showing correctiosn, not actual target dimensions.

 

[Fast14riot]

Which is why mrad scopes are rare in f/class. Target is in MOA, its known distance, and 1/8moa clicks are common for exactly the reason you state, ability to center your group.

 

[Ned Ludd]

Someone using a mil scope made a plotting target by overlaying the 1000 yd F-Class target with a milliradian grid. That's all it was and the reason why the grid didn't line up well with the MOA-based scoring rings. Not sure why all the confusion, it was pretty obvious what had been done.

At 1000 yd, an angle of 0.1 mrad subtends an arc of 3.6", versus ~1.3" for an angle of 0.125" MOA. In other words, a single click adjustment for a scope with 0.1 mrad turrets will move the point of aim approximately 2.8X farther than a scope having eighth-minute click adjustment turrets. Sure, you can certainly use a mil scope in F-Class, but the adjustment is far more coarse than is desirable. In fact, it is even more coarse than an MOA scope with quarter-minute turret clicks. With 0.1 mrad turrets, you'd have to adjust your holds in addition to dialing the turrets, which is just one more thing to have to think about [unnecessarily] while shooting in a match. I rather suspect the result would be a few more "9s" every match until the shooter became very familiar with the use of the scope/turret adjustments. Having said that, someone well-accustomed to using a scope with mrad turrets might well suffer the same fate upon switching to a scope with eighth-minute turrets, until they became very familiar with its use.

IIRC, March makes (made?) a scope with 0.05 mrad turret adjustments, which would certainly be better for F-Class. However, the availability of numerous high quality MOA-based scopes makes the point moot, with the exception of individuals that already own an mrad scope and wish to give F-Class a try without spending an additional large sum of money just to buy a new scope. In that case, the reason for the 1000 yd F-Class target overlayed with an mrad grid is obvious.