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If you are loading a revolver caliber like .38 Special with real revolver bullets having a cannelure or crimp groove, you cannot go far wrong by seating to and crimping in the groove. This pretty well determines the OAL and it will nearly always be ok for a load in the standard range given in the book.
Rifle bullets should be seated so you can load the magazine if you wish to shoot as a repeater. This will normally keep your bullets from jamming into the rifling. If you are firing single shot, you need to control seating to give the appropriate jump to the rifling. Which is determined by shooting for accuracy.
Autopistols are the most sensitive to seating depth/OAL. Go by the book if you have one with a "recipe" FOR THAT EXACT BULLET. If not, the way to start is to load as long as the magazine and chamber will accept.
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