I was tempted to mention Nikon (and Vortex), but I thought the initial replies were going to be that decent and <$500 were oxymorons.
IMHO, if you really want to do routine turret cranking, the only scopes that are consistently (scope to scope) repeatable are Nightforces.
I just picked up a Nikon Buckmaster 4.5-14 side focus with Mil-Dot from Cabela's for $269. I love them. This is my third one and it sits on my 22-250 in place of my Burris 12x fixed power. I have a Leupold 4.5-14 on my 30-338 and it is awesome, but twice the price.
I run a leupold AR 3-9. It works perfect on 3x most of the time and if ones hanging way out I'll just crank it up and use the mil dots for holdovers. You could make a 10x work but I like having the option to dial it back. Amazingly clear glass for 350$ish.