The dots cover alot imo.
I have the b&c in a 3.5-10x40 on my 280ai.
A 140 ttsx is leaving the barrel at about 3150.
I am sighted in at 300, and hit the gong near center out to 600.
At 700, use the thick to thin as you aiming point, but look at where the lowest wire is, and move the thick to thin there.
Like mine alot. Not complicated, and I have it on 10x.