I have 1786 and 1792 edition of d'Urtubie.
I have only come accross the thread today, given I have not been able to access the forum for a ltitle while.
Conerning the artillery used in 1815, and earlier. Under the 1st Restoration,, the artillery equipment was retained as four calibres for the field artillery:
12-pdr with 6.4inch Howitzer
6-pdr with 24-pdr Howitzer
Of interest to this discussion is a report signed by Marshall Soult, dated 27th May 1815. Soult identifies three main principle advantages of the current system fully implemented in 1813 (SHAT Xab 74 2 5):
1) the guns and vehicles are made to a great regularity and suited for the service
2) The system is cost effective for reason below.
3) two wheels were used. For guns and rear wheels of caissons, forges and other military transports. Small wheel for limbers and front wheels of vehicles.
On a different note, the Guard artillery at waterloo fielded 156 guns.