Winchester Ammunition Manufacture dates


#1

Since at least 2000, Winchester ammo lot numbers have included the manufacture date encoded within. The date is contained in a LL## group, where L is a letter and # a number, making up or included in the lot number impressed into the box tab. Numbers preceeding the LL## probably equate to the production line. The first letter is the year:
R = 2000
S = 2001
T = 2002
U = 2003
V = 2004
W = 2005
X = 2006
Y = 2007 (skip Z and A)
B = 2008
C = 2009
The second letter is the month:
A = January
B = February
C = March
D = April
E = May
F = June
G = July
H = August (skip I and J)
K = September
L = October
M = November
N = December
The two numbers following are the numerical date, but reversed. Examples:
10 = 01
20 = 02
21 = 12
51 = 15
42 = 24
52 = 25
92 = 29
13 = 31
Examples from my Winchester boxes:
RM60 = 6 November 2000
RM80 = 8 November 2000
SB61 = 16 February 2001
31TD01 = 10 April 2002 (45 Auto)
30UA61 = 16 January 2003 (9mm Luger)
022VK30 = 03 September 2004 (9mm Luger)
71WM40 = 04 November 2005 (380 Auto)
30XF90 = 09 June 2006 (9mm Luger)
26YH80 = 08 August 2007 (9mm Luger)
31BN22 = 22 December 2008 (45 Auto)
30CA31 = 13 January 2009 ((9mm Luger)
Check out 2006 and 2007 Winchester ammo recalls and you will see the pattern.