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It may have up to two grains less case capacity depending when it was made. Newer Lake City cases are made of harder brass and are not as thick, meaning more case capacity.
If the cases are hard to size you can size them the first time with a 30-06 die or a carbide .45 acp die to reduce the base diameter.
Then size again with a normal .308 die, the above depends on how large in diameter the military chamber was the first time the cases were fired.
Its good brass and I just got 250 Lake City once fired cases delivered today.
Make workup loads starting at the suggested start loads and workup reading the cases for signs of excess pressure.