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WTB egw base for 700sa -found one

It depends on your intended use and optics.
If it's only going to be used for hunting at typical ranges of 350 yards or less with an optic geared towards hunting a 0moa would be fine.
If you plan on shooting longer ranges 600 yards and out with a purpose design scope get the 20moa so can take better advantage of the adjustment range and features of the optic.