This is the correct answer for SSA OIG. The SSA OIG office was first established by a retired US Secret Service agent. When he selected his staff, many of them were also retired USSS. They chose their handgun and ammunition based off of what they were using while working for the USSS. SIG P229, shooting either Federal or Speer .357 SIG JHP.
None of these contract numbers surprise me. As was stated in an earlier post, buy in bulk for cost savings. Spread the contract over multiple years and allow for extensions to lock in costs before the prices go up. Keeping that in mind, don't you want the government to try to use your tax dollars in a good way? The vast majority of this ammunition will be used up in monthly, quarterly, and annual requals. Contract over runs in any caliber I shoot makes me happy.
Besides, is anyone really worried about a group of armed Department of Education OIG agents storming the local Piggly Wiggly
Be safe.