It sounds like you really have a tight ("target") chamber but if factory rounds fit OK, and it passes the GO gauge, I don't think the rifle is at fault.
I think you have a resizing die that is not resizing quite enough. (Remember, loading dies have their own tolerances, and sometimes the tolerances "stack.")
Try calling the die manufacturer and asking about a tight die or an auto rifle die; the latter are generally smaller because auto rifles often have little seating power.
Jim
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