I have a buddy that is running the SS 3-15 on his Savage .308 which he uses for deer hunting & range use. I run a SS 5-20 on mine which is used for deer hunting, range use, & banging steel at longer ranges.
Personally have never had a problem with the turrets moving unless I want them too. I wouldn't let the lack of locks or caps make your decision, but that's just me. The turrets are firm enough that it just really isn't an issue.
Get on that SS 3-15 before midnight tonight, using this code - 20SS315 to save 20% off which brings the cost down to $559.96