It is perfectly normal to have a different OAL with a different bullet nose shape. If you didn't change the setting on your seater die, I suggest you don't change the seater die setting. I have built loads with a particular bullet then seated a different shaped bullet without moving the seater die setting, worked up the load and got excellent accuracy. Case in point: A 284 win shoots bugholes with 168 Berger VLDs . Worked up a different load with 120 nosler ballistic tips same die setting and it shoots them very accurately too.
Provided you haven't changed the powder charge you used with the other bullet, you should make some with that seating depth with less powder and work back up to the ones you already made. It would be hard to say how you have affected pressure if the new bullet has a longer bearing surface or sits deeper into the powder area of the case.