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You did not say what cartridge you were casting for. In some instances you may not need to size at all. For instance, in revolver cartridges you may find that even oversize bullets will shoot well...revovers tolerate oversize very well if they are not so big that they keep the round from dropping into the chambers (or so tight in the chamber that the bullet will not release easily and raise pressures when fired). However, auto rounds (9MM, .45 ACP, etc.) may not want to enter the chamber if oversize.
Lee Precision has stated for years that, "...little or no sizing is required...", before shooting the bullets cast in their molds. Traditionally, Lyman molds dropped bullets that were larger.
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