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picked up a used rossi single shot rifle. i ordered a scope mount base kit from rossi. two of the mounting holes on the rifle are boogered up. i need to run a bottom tap in them and try to straighten the threads out but i don't know the thread size. the srews that came with kit screw into the 4mm die in my tap and die set but stop tight 1/4 way up the screw. i don't have bottom taps on hand so i can't check the holes with a 4mm. anyone have an idea as to the size of thread here? thanks.
 

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They are 6-48 NS (National Special), all standard scope base screws that are #6 are that thread. Larry
 
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