In a way there are three OAL's for your 9mm. The first is your magazine length, IE the longest bullet you mag will hold. The second is the chamber length, which is the longest your gun will chamber. The third is the longest bullet your gun will feed between the two. I generally go with the shortest of the three for my OAL. Or for my 9mm as that is the only caliber that I reload for more than 1 gun, I base my OAL on the more picky gun.
Generally with round nose bullets the magazine length will be the shortest of the three.
Some of us like to experiment a bit more, others just stick to the numbers the manual provides. Nothing wrong with either approach as long as you are making safe and functional ammo.
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New gun, same ol' shot.
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