There seems to be a lot of various government groups buys large amounts of ammo recently.
Check it out:

The Department of Homeland Security is buying more bullets with a solicitation for over 141,00 rounds of sniper ammunition.

According to a solicitation posted on FedBizOpps, the federal agency is looking to procure 141,160 rounds of Hornady .308 Winchester 168gr A-MAX TAP ammunition.

Such ammunition is sometimes retailed as “Zombie Max,” a marketing gimmick alluding to its power.

“What makes the .308 ammunition so deadly is the long range capability of the round,” notes James Smith. “The ability is called ballistic coefficient, or the efficiency of a projectile in overcoming air resistance as it travels to its target. According to Speer Reloading Manual Number 13, the .308 165 grain has the highest coefficient of any hunting rifle.”

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