I No evidence to prove that other than the humongous buys by HS.
Is there a way to see what the PO's are for?
After all it may make sense if HS is buying spare ammo for training, using up budgeted money, or what have you.
If they are purchasing other than Home land issued ammo and calibers then you could be correct.
What would Home Land Security need with 270 Win or 30-06 when they have 308"s and 223's why would HLS need 38 Special or 357 mags or even 22LR when they use either 40 S&W or 9mm in their handguns. I can understand how they may want target ammo in 12 ga but not in 20 ga.
If it is a blanket PO for assorted ammo then I would agree the Government is manipulating the price and the supply of the ammo for the private sector.
But as ammo prices are still high ammo companies will increase production and add capital, labor, and resources to meet the demand by both the government and the private sector. It may even drive ammo prices down after the government realizes that it can not buy up all the bullets from the people.