I had no idea. I thought they were all made on the 1917 Enfield. I wish I could go buy a book about A-Square...and find a 6.5-06 made by them.Yes they absolutely did. Art alphin was the one to standardize the 6.5-06 A-square. I once saw some Norma weatherby ammo for them so that's another avenue to check. The rifles he built in this size cartridge were based on a custom Winchester model 70 and were great shooters. I have two of his other calibers and they are amongst the most accurate guns ever owned. A lot of thought went into anything gunsmithing or ballistics he ever put his hands to. A great cartridge.