Yes the saami regulates factory loaded ammo. Based on ancient history. The brass used today is the same as 308. Of course with design differences compared to modern cartridges. However after having been loading for over 40 years I can tell you that within reasonable acceptance of over manual specifications, which everyone here has done at some point I am certain, a significant improvement in velocity over the stated manual maps is achievable. Definitely if you provide a correct throat and spend right to take advantage of modern bullet technology. The thirty-ought-six significantly exceeds the 308. Of course I guess that depends on your definition of significant. LOL. The 30/06 as every other larger case / caliber exceeds with heavier bullets and longer barrels. of course some of those big guys are significantly larger cased / caliber by the way. I just throw my hat in the ring that saying common Sense rules to a given point. Modern design technology has made significance benefits to better case design. And let's just be honest guys who doesn't like the 35 whelen. Mid bore kind of heavy bullet modern velocity makes big holes in big things! LOL. As for myself I've got to be honest I'm really looking that building a Sherman short!!!!