Mixed boxes of 270 and 30.06 ammo.

.30-03 was issued then withdrawn in favor of the .30-06, true, but when the Army surplused the bulk of their Great War rifles, a lot of them were freshened up by chambering in .30-03 to clean up the throats and shortening the barrel to remove an ovaled muzzle.

Winchester's choice of .277 wasn't entirely "random" nor "quirky". There was a tremendous demand for rifles in Europe following the war and under the terms of Armistice most of the potential market was forbidden to own a current or former military caliber rifle. An easy work around was to swage down a 7mm bullet to .277. Plus the landscape was awash in spent USGI .30-06 cases. A .270 case formed from a .30-06 is a tad short, but still works well enough.
 
If you are in doubt or have any question as to your own ability to differentiate between the two at any time, find someone to either give them to who can or a safe means of disposing of all of them. Then get new ammo for each caliber rifle. No need ot take a chance injuring yourself or someone else.
 
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