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The hardness of steel does not really have to do with whether or not the steel is stainless.
Hardness is determined by the way the steel was heat treated and tempered.
Stainless steels contain...

GD's are made of terribly hard steel - not the best choice for learning to hone.
If you can un-ugly the grind of one of those, you are can do a great job on a regular razor in a fraction of the time.