"...averaging 2560 fps..." Sounds like deteriorated powder. I'm wondering if it may have been reloads. Current start loads of IMR3031 run 2697 FPS. An 'LC' head stamp doesn't really mean much. Just a WHAG though.
The absolute best .303 Ball I've ever fired was 1944 vintage DA. Fired in about 1981ish. It made the crappy IVI we got later look Chinese.
"...By 1968, the only use for M2 ball was..." Nope. U.S. National Guard still used M1icon Rifles and .30 M2 ammo. The Kent State shootings happened in 1970. The Ohio National Guard were carrying "loaded" M1 Rifles.
"...if I'm comfortable..." As daft as it sounds, that could not be more accurate.
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