I've gotten submoa out to 300 and 1.5 moa out to 600 with a TA31 donut. KevinB won a precision rifle match with his TA31. In my book, thats better than accurate enough. I honestly dont believe the TA31 reticles are not accurate. I do believe that a crosshair makes it "easier" to be accurate, but a good shooter can work almost any reticle. When shooting for accuracy (especially for accuracys sake), most times you are afforded the opportunity to take extra time and work the reticle. With a donut this is all you need to achieve the same or VERY similar types of accuracy.
Come to think of it, maybe saying the BAC reticles are slower to be accurate but faster at everything else and the nsn reticle is faster to be accurate and slower than everything else is a better description than saying the nsn reticle is more accurate but slower o use and the TA31 reticles are less accurate but faster.
Wow, thats a mouthful! Im sure theres a better way to write that without having it be all one sentence, but hopefully you know what I mean.