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LC 55 (with NATO cross) is an M-2 Ball (30-06) case from the Lake City Army Ammunition Plant manufactured in 1955.
The case was cut down and re-sized for that pistol application. The rifle case is thick and will withstand more pressure than your pistol can take. If you reload, you need to be careful because the thick case walls reduce available powder volume. "Cook book" loads from a reloading manual will contain too much powder for a thick-walled former rifle case and cause excessive pressure, slide battering, cycling and extraction problems.
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