Since I bought my BD400 earlier this year, I had a HAA Optimizer on it.
I just never had the opportunity or right conditions to shoot it at 60 yds to apply the correct "dial up" tapes.
I'd just sighted it in up to 40 yds to date using the reticle markings in the Vortex XBR.
Today I finally had the combination of time and calm weather to use the Optimizer as intended.
Shooting off a bench rest, with my arrow set up (418 gr Zombies) the Optimizer guide said use the #28 setting to start.
So I turned the dial to there and hoped I'd see my arrow again

First arrow, 1/2" from dead center. The next was 1/4" or so from there. The third arrow was about 1/2" over.
I've read here about all the good long distance groups being shot, but I have to say I was pretty impressed with a 3 shot 1 1/4" - 1 1/2" group at 60 yds.
I thought the BD400 was a "shooter" but the Optimizer system really worked well for me and showed me the Excal's potential.
Putting the #28 tape on and working my way back in from 60 yds I shot at various distances using the dial up now and it was pretty much on the entire way.
Can't wait to use it "for real" in the field.