Hello folks.
Well, I've placed an order on TA31 ACOG and I've been waiting a month now. It seems my vendor can't get donut or chevron easily. He said he has triangle, but I'm still more leading towards donut / chevron because it covers less of your target. I thought donut will be the best choice since you can use it as a red dot and it doesn't cover your target in 150-300m range where triangle does. Chevron looks very attractive too but some say it is way too fine for general purpose work. It is also calibrated for 14.5" barrels instead of 20" which I'm going to use.
So my question is, can you really distinguish between inside and outside of donut and be able to shoot accordingly? (outside for speed, inside for more precision in 150-300m where your reticule will be completely over the intended target)