99.9% sure this is 11mm gras. I need .1% to verify since i dont have calipers.. : r/ammo
WTB: Colt Vickers links in 30-06 and 11mm | 1919 A4 Forums
11×59mmR Gras - Wikipedia
Made some cartridges for my 11mm 1874/80 French Gras. This is using properly made brass. Usually I use .348 Winchester brass fire formed to fit the Gras. : r/reloading
11 x 53r Comblain Nordenfeld SFM Gras Bullet - General Ammunition Discussion - International Ammunition Association Web Forum
11x59R French Gras Black Powder Ammunition Box of 20