From Federal's web site:
• XM193 product is first run, first quality product manufactured at Lake City Army Ammunition Plant for Federal Cartridge and is made to Federal specifications typical for commercial ammunition.
• All XM193 product is the same regardless of the sku or part number. (ie. XM193C is the same as XM193F, XM193CBP and etc…) The only difference is the package configuration.
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No ammo company these days will sell rejected ammo to the public, especially over-pressure rejects.
Lawyers would have a field day, and many folks would be new "lottery winners".
If anyone has reservations, just contact the manufacturer, they will give you the real skinny.
The closest thing I ever saw to "reject" ammo was patrol turn-in ammo from Israel that was available in the 90s. This was grungy, stuff turned in by field troops and range leftovers from training. The importer cleaned it in a cement mixer, and sold it in 30 cal ammo cans.
It was very cheap, and all went bang, no problem. But the importer was totally up front about what it was (real surplus, no guarantees). I shot several thousand rounds of the stuff and may have tossed less than a handfull of it due to huge dents.