So far, it appears that the first letter is the month.OK, I'll start with Hornady:
K27K07 Oct. 27, 2004
K07K14 Oct. 7, 2004
L22K27 Nov. 22, 2004
F12Q12 June 12, 2009
And some CCI:
H19K08 Aug. 19, 2004
J07K08 Sept. 7, 2004
H04K14 Aug. 4, 2004
Looks like I need to shoot up some 9 year old ammo.
I will add my $0.02 worth, no refunds. I got HMR ammo this September with date code H21U10Looked through my HM2 stash.
Only one box of Hornady, lot# K31R13 - Oct 31, 2010
Couple bricks of the old CCI Fast and Furious, lot# J08K10 - Sept 08, 2004
Couple bricks of the newer CCI blue box, lot# E04S03 - May 04, 2012
Also got a case and a half of Eley made in 2005
So yeah, I'd say the Hornady lot dates are decoded the same way as CCI. And like you, I need to start shooting a lot more HM2!