I reload a lot of military brass. In addition to .223/5.56, I use once fired Lake City 7.62 NATO for my .308 and 7MM-08. It is super easy to turn 7.62 NATO into 7MM-08.

I have tried a bunch of different systems, including the little cutters you can put in a drill chuck. The problem I had with them is consistency. It is easy to take off too much brass and then the casing won't hold primers very well.

What I ended up with is a Dillon Super Swage . It doesn't remove metal, it presses it back from the edges of the primer pocket. It's fast and will last forever.