I want to try and get to grips with printing some 4x5 negatives as contact prints with the ultimate goal of matting and framing them.

Question:
Through testing, do you find the time for the film edge to reach max black and then use this time, aperture setting and enlarger height for future contacts prints of the same film batch or do you really need to do a test strip for each negative you want to make a contact ring from ?

Ian