See this line - French shotguns from 1875-1900 proofed for shells up to 90mm.https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=516435&page=2
Just to illustrate the point, here is a Didier-Drevet barrel, 16 gauge which looks to be chambered for 8.0. It is double proofed in Saint-Etienne for PS powder so it is pre-1900 and it does not have the 1900 prize marked on DD barrels but rather 1855, the date of his original gold medal at the Paris Universelle. Barrel is Damascus. It is post 1889 since chamber is marked in cm. (The barrel oddly is not dated or I cant read it.