Need size differance between 30-06Ackley and 30 Gibbs



Hey their guys I know that a few of ya'll shoot the 30 Gibbs , I was wanting to know what the differance was between the 30Gibbs and the 30-06Ai , I know that the shoulder is blown forward a little bit but not sure what the exact measurements are,
Also as far as sizing the case can a regular 30-06Ai die be used for neck sizing , so all I'd need to get would be a FL 30 Gibbs die

I ask these questions because I have a 28" tube that I want a little more velocity from than the regular 30-06 offers and I have 500 pieces of Lapua brass for it.