Truth is, a spotting scope is worth absolutely zero on a pdog outing. I bought one while I still lived in Louisiana in anticipation of my move here to Colorado. The acerage you have to view is immense out here, and a spotting scope so greatly limits your FOV that finding a pdog (let alone relocating the same one once you settle in behind the rifle) is difficult at best.
Your best option is a pair of 10-12X binocs. They don't have to be really upper end, either. Unlike most "hunting", the most and best pdog shooting occurs in the wide open under intensly bright skies.
In my experience, as it relates to pdog shooting, a spotting scope is a complete waste of money and time.
Mike
edit: Save your money and put it toward a good laser rangefinder. That thing will be in constant use.
