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If you can't find the right number, you can use any larger RN top punch, as the nose will centre itself, any other top punch will probably damage the bullet. Some folks maintain that this type of arrangement, where bullet centers itself in top punch is actually more accurate, I tend to agree IMHO. Sometimes you have to experiment.
Here's a cross reference from molds to Lyman top punches (go to "Moulds" at the upper left, then scroll down to "Lyman Top Punches"): http://www.castpics.net/
If you want your bullet forced all the way down into the Lube/sizer die, you will need a top punch smaller than .40