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I am purchasing a mount for my Tikka T3. How do I know which screws I need?Pre-2003 Tikka T3 rifles use 3.5 x .5 metric screws.Post-2003 Tikka T3 rifles use 6-48 screws. I have received my mount for the Tikka T3 but the screws will not start. What do I do? Did I order the wrong screws?The diameter of the different-sized screws is within .001”. The thread pitch of the screws is within .001” as well. If the screw you have will not start, neither size will start. This is happening for the fo …