Military Ammo ID

[DeadeyeDick64]

Hello, new member here. My Son in Law recently inherited a large quantity of Military ammo, muchpacked in stripper clips. I have researched and THINK I have partial identification on two of the; and wondered if anyone here can assist
1. Turkish
Marked T 7.9 FS. 1940

2. Canadian Arsenal
Marked only DA 5. With what looks like a pyramid within a circle
Anyone have an idea of caliber?

3. Marked only DM 4
Again any idea of caliber?

any assistance would be appreciated ( sorry I can’t figure out how to post Pics here)

 

[dlbleak]

Welcome aboard. Some pics might be helpful in identification

 

[Letfreedomring]

Then open your gallery or image file or take pic then when it uploads click on 'insert' button then 'full image'. Not sure on a PC since I use my phone exclusively. Oh and welcome!

 

[swampratt]

https://cartridgecollectors.org/headstamp-codes/
and this one scroll down until you find your headstamps

https://en.wikipedia.org/wiki/List_of_military_headstamps