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If you keep the OAL length the same you won't be changing the depth that the bullet is seated in the case regardless of the case length. The crimp will be different on shorter brass than longer, but not the case capacity if you use the same OAL with varying lengths brass.
What will effect pressure is the ammount of space inside the case, which is the distance from the base of the brass to the base of the bullet, that's what determines case volumn, not the distance from the tip of the bullet to the top of the case.
Keep the OAL length the same, I generally load to nearly the max length my magazines can take regardless of the length of the brass.
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