Years ago, in Australia ( about 1970s) our Gun trade received very large quantities of Canadian-made .303 Ammo, both in Linked belts and in 1248 round crates (48 round packets). The headstamps were “DAC^, DAQ, DCC, DIz,” with dates going from 1941 to 1944 (“44”).
I fired a lot of this ammo, and reloaded the cases (Both Boxer and Berdan) for many years. Once I got really into Movie work, a lot of the Berdan cases (DAC^, DAQ, were made into “Mark L9Z” type blanks, and used up.
Some of the ammo was actually “Pulled down” and the Corrosive Berdan primers replaced with Non-Corr RWS#6000, for better Bore wear.
I could probably find some of the Blanks still about, or even empty cases…I just have to look for them. The “Q” is quite definite ( a O with a curly bottom, and is NOT a Badly stamped “C^” ( C-arrow) and the Packets were quite clearly marked “DAQ dd-mm-yy” as in normal Commonwealth practice.
AS to years of DAQ production, my only recollection is “Full year” dating, for 1942 and 43; I don’t remember anything earlier, and definitely no “44” ( the DAC^ was only (in my experience) “DAC^ 44 VII”).
Some Canadian ammo came out of Greece also, in 1980s, along with the British, Aussie, Indian and South African Mark VII ammo ( 1944-50s Mil aid), but, afaik, it was mostly DIz and DAC^ for the Canadian).
Will keep looking for the “DAQ” headstamped cases…I need to clear out a lot of .303 cases for an upcoming WW I Movie which woill require “000s” of Blanks…