I have $100 worth of Simmons 44Mag on my pet '06, since 1997. It's travelled around a good many miles of jeep trail in my 4WD truck; it has held its zero quite nicely. Maybe 200 or so rounds fired since I put it on.
It works well enough from 100 yards on out to 500 yards...
I use an el cheapo K-Mart/Wal-Mart spotting scope, 20X60 power. Not much good above 40X, but so what? I suggest a quality tripod, though--you can upgrade the spotting scope in a few years if you really think you need to.
FWIW, Art