All of the gun forum experts will turn back flips if the Army just happens to go with a full size all metal 10mm. There are many loads available and the gun will hold 15 rounds. Link Removed
When I do carry .40 I like either the 155 or 165 grain loads. Speer makes the Gold Dot in 2 different speeds of the 165 grain version. The ATK ammo site has ballistics information and pictures on Federal HST and Speer Gold Dot ammo that has been shot through all kinds of material for LE testing...