I switched over to the Winchester AA loads for classes. Polishing the chamber helps a great deal, as well as not shooting crappy ammo. That frequently leads to extraction woes. People tend to shoot crappy ammo in a rough chamber, and never clean it. I have done that multiple times, after investing in a set of the proper hones, oil and a low-speed cordless drill. O - Jul W - Aug D - Sep E - Oct R - Nov X - Dec Then look on the left side of the barrel near the receiver and look for a two letter date code stamp and follow this chart with the first letter being the month and the second being the year the barrel was made ī - Jan L - Feb A - Mar C - Apr K - May P - Jun LW MAGNUM (ALSO INCLUDES M/1100 “LT”)ġ963 TO APPROX. “LIGHT WEIGHT” (“LW”) (ALSO INCLUDES M/1100 “LT”) Model 870 LETTER SUFFIX (DESIGNATES GAUGE) My search fu is mighty today, I found this:ġ950 TO APPROX 1968: NO SERIAL NUMBER PREFIXġ968 TO PRESENT: LETTERS USED (IN SEQUENCE)
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