One if I tighten front screw down real tight the mag sticks. I took that same stock and put on another tikka rifle and no problem.
I've owned several T3's over the years and played stock swap many a time (factory, B&C, McM) and I've seen this issue multiple times where the mag sticks after tightening one BA into a particular stock but same stock on another Tikka T3 rifle (same torque)fits the stock better with no problems.