Re: target knobs
To answer Matt's question, no Knobs and turrents do not do the same job.
Knobs, like the Stoney Points, only indicate the movement around one revolution. Great for making small adjustments.
Turrents have a vernier scale so that they will indicate multiple revolutions. This would be of benefit when lots of elevation change is needed ie during long range shooting. The work done by the Leupold Custom shop is great and the knobs look and work very well.
Other companies like Bausch & lomb have turrents that can be installed at home. Most other companies require the scope to be returned for install. Burris offers this service and is quite reasonably priced.