I have one and love it! Mine wears a Leupold VX-3 variable with a sideplate mount, so I don't use the iron sights past 50 yards, myself.
(It's also been fitted with an unflutted cylinder to add a little more weight and make it unique.) It sure does tame full house magnum loads!
Anyway, each of the 4 front sight elevation 'clicks' can be adjusted individually to whatever height you want for your desired range.
I think the original silhouette game was 50, 100, 150 and 200 yards.