.308 maybe. Measure the length of the mag box. I have a similar vintage rifle that was a .243 from the factory and they cut the mag well shorter for the shorter cartridges. I'm not sure if they cut the .223 shorter still.
The bolt is long, the magazine is sized for the round that the gun was made for. I wanted to convert my .243 to a .280 but without milling the bottom of the receiver out and finding a different mag box it isn't possible as a repeater.
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