As far as a difference between say a 3MOA red/ green dot and a halo, there is something to consider. That halo is not where you wouldd be aiming. There is still a dot in the center. Must aim for dot on target.
I feel the halos are less than advantageous for a couple reasons:
1. Too much of a good thing. Unless you have a high quality (Not inexpensive....) optic with a very thin halo, the light of the halo will block out many things you are looking to see thru the optic. The light will often also 'blind' the optic with too much light at even the lowest setting.
2. 'Shotgun mentality'. If you see the ring, you DO expect to hit whatever is inside the ring. Remember, at 100 yards, a 3MOA dot is a 3" circle. The bullet you shoot is........... .224 in diameter. In other words, you can be 12 bullets off to thge left or right and still be 'in' that 3MOA dot. The halo? -"Well, I sighted in the rifle, and I shoot dead center of the halo. All I gotta do is put the halo on the target and squeeze off some rounds. I'll hit it."
Yeah, you might. But truthfully, you will be shooting scattergun style, but your rifle simply does not deliver that kind of coverage. When I see people pushed to perform with the halo, I see their accuracy fall far behind, and there is no increase in speed.
