I had Tikka rail rings on my fathers Tikka 6.5x55 and 2 years ago shot at a Moose and missed because the dam rings let go! I put on a set of screw on bases with redfield style turn in rings to make sure this never happens again! I don't trust these rail type rings anymore, even though Talleys are well built I can't think of putting this type on my 308 heavy barrel Tikka model 585 now unless I put Talley type screw on Weaver base down first, just my experiance, Dale in T-Bay