You guys peaked my interest so I just went and measured some military rounds I have. None were date marked but half were FN and the other half were AI or A1. Both measured .060-063. Neither had any additional taper or chamfer at the edge. Certainly nothing approaching .049. It did appear that the edges were broken or rounded ever so slightly but nothing more.
I use reformed Greek military 303 brass for my cases and they measure out at about .060 and feed a bit snug in Dutch clips. I don't think .070 would feed in any of the clips I have.
The .060 rims fit just fine in my 1892/3 Gibbs. Maybe .070 would fit but I never thought about it as I headspace off the shoulder.