It's been a while for me, but I practiced for driven birds at Bald Mountain, in Lake Orion, MI, and then (as I recall) the Detroit Gun Club had a 120 ft Condor mounted station.
At 120ft, the complexity of man-lift mounted traps becomes an issue. 150's and 200's have multiple sections which would make reloading the trap take about an hour. Plus they have huge heavy bases, and require special training to use. And cost big.
A 120, with angled up trap, should give a 50 yard, face-on, bird at a fair speed. It's a good simulation for driven birds. If launched over a ravine, you might get 70 yards, but it's pretty iffy.
