Mr Biker -
? Military brass usually has a maker and date. So I suppose that "AP10" is really made by AP in the year 2010. Now most military brass is made to very high specs, but watch for crimped or Berdan type primers. The old boxer primers come out just fine, but because the entrance to the primer cup has been crimped, the new primers can't be installed without a little work. If that is the case, then you'll want to start a "dead brass" box and toss them in. For the same amount of work as fixing one piece of mil brass, you can pick up 10 more Fed, Win, Speer, or some other much more useable commercial grade brass. Shame really. A waste of great brass.
? Best place to start is by making 5 "dummy cartridges" with no primer and no powder. If those will all 5 drop into and out of the chamber of your naked barrel
using only their own weight, then you're set to go. Usually though, a new reloader will have some basic die setup issues, and minor die adjustments to make, which are much better spotted without using 'live' ammo.