Some scope brands like Leupold make custom turrets based on your ballistics. That's a great solution! The problem, though, is they are only good for one environmental condition. If you get the turret for 30 degrees and 9,000 feet in elevation, when your next hunt is in a different temperature and elevation, you'll need a new $90 turret. The idea with Turret Tags is they are cheap and simple. And, in fact, you can usually take off the clear strip and nudge the tags a bit to adjust for a different condition. If not, it's cheap to get another if needed.