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The OAL listed in reloading manuals is a suggested minimum. I, and am sure others as well, always try to seat the bullet as long as possible while still being able to load into a magazine and feed reliably. If you change your seating depth, pressure WILL change. Seating deeper tends to increase pressure and seating longer tends to decrease pressure, with all else being equal.
My suggestion is for you to make a dummy round, no primer or powder, and seat the bullet as long as possible. See if it fits in the magazine, if not, keep seating deeper until it does. Then check to see if it chambers into your gun, if it does, you have your seating depth, if not, seat deeper until it does so. You now have the seating depth of YOUR gun with that bullet. Now you may work out loads to test within published data.
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