I am certainly no 280AI expert! The change (or not) as it went to a SAAMI spec cartridge has generated a lot of debate. Specifically, is it indeed a change or is it simply confusion related to how the case is indexed when measured?? This thread has some great info, and a lot of it is conflicting
280 ack imp 40 degrees vs Nosler brass
You could call or email the die manufacturer to see what they say. If you have a way to measure headspace you can give your FL or body die a run and see if you have enough clearance to bump the shoulder. If you do, you are GTG.