Matt:
The issue of pressure is relative. If a skivved 2 3/4-inch hull is used in a gun with a more or less normal forcing cone, the added pressure is minimal. Sherman Bell tested this whole issue long ago with professional help and equipment. His results are in DGJ. He found that the added pressure for the longer hulls amounted to about 25 psi., which is negligible.
With heavy unskivved hulls like Federal, it might be a bit higher.
You can cut back hull mouths if it makes you feel better. But I've used 2 3/4 Win AA hulls in my 12s and Rem black hulls in my 16s for years and have noticed absolutely no cause for concern. I keep velocity around 1150 fps.
Best, Kensal
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