Cracking nodules is common but look carefully to see if you can see any sign of the contents, A lot of nodules collected look promising but are barren so tapping is essential. If no sign on the outside I would usually tap on the beach since carting a rockery back to the car is unwelcome :)
Tapping can of course break the ammonite (assuming there is one in there) in two, so trying to work out the most likely orientation will help.
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