I have a Keller on my bow and I love it.

Its dead on from 0-30 yards as long as you are at least 12 feet up

.Past 30 yards there are two other pins that drop in as soon as the elevation is right.

On the ground you can lock it into one of five slots for various yardages.

The only problem I see may be the speed thing. I don't know how many fps these sights need to work correctly so I would check with my pro shop to make sure.

SF