[Hammerslagger]

"WCC" is for Western (or Winchester) Cartridge Co. The "12" is for 2012. The "+" indicates that the cartridge is loaded above US standard pressure. In short such a head marking is not for commercial ammo. It is usually found on ammo loaded for a government agency or the military.

A bullet not seated to the correct overall cartridge length may be a loose fit in the cartridge case; and may be unsafe to fire.

Contact Winchester ammo customer service from a toll free phone number that you can find on the internet. I would not shoot any more ammo from this lot.

Phone # 800 356 2666 option 3 then option 6. Have the box with the lot # on it when you call.