I assume you do not have a 6-48 tap to run in there.
First, did you clean the threads well? All it takes is a little bit of grit or old thread lock/sealer for them to bind. Also make sure your new screws are clean.
Second, if clean and still not working. Do you have an extra screw around? If so, use a small file to make a notch in the end of the screw. Thread it in there. It will act like a cleanup 'tap'. BE CAREFUL. It is easy to cross thread and then you will have buggered up the rifle.
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