.30USG stands for .30-calibre US Government; it was loaded with 40 grains of Whistler-Aspinwall smokeless powder, hence the commercial designation of .30-40.... and used in the American version of the KRAG-Jorgenson rifle.
Your 6.5x52 Mannlicher-Carcano was loaded in 1936 by Societa Metallurgica Italiana, the Italian equivalent of GSW. They made just about anything out of metal and did it all well.
Your .303 Cordite Mark II was made in Canada before or during the Boer War. The charge is 31.5 grains of Cordite Mark 1, the bullet is a 215-grain RNFMJ. This was very accurate ammo for the period. DC normally is Dominion Cartridge Company, so this would be commercially-made ammunition on a military contract. Ammo made in the Government plant was stamped DA. The Broad Arrow indicates that it is made to Imperial standards and is Government property. MV was 1960 ft/sec nominal. The later Mark VI was identical except the velocity was raised 100 ft/sec to 2060. Work then proceeded at a frantic pace to develop the impact-unstable Mark VII which replaced the short-lived but awe-inspiring "Dum-Dum" series: Marks III, IV and V.
Your 7.62x54R round is made in Finland in 1933 by VPT (Valtion Patruunetedhas Tikkakoski) and is a real piece of the Winter War. Ammunition is still being made in Tikkakoski as are the wonderfully-accurate Tikka rifles; the city also has a terrific air museum with the only surviving Brewster Buffalo AND one of the P-39s that my Dad rebuilt in Edmonton. Yes, I am prejudiced. And there is a very tiny chance that I might have spelt the name of the company correctly. I tried, anyway. Tiina would know. It means Tikkakoski Cartridge Factory. (I know precisely 6 words of Suomi; these are 3 of them!)
Your DA .303 is a 1941 and is standard Mark VII Ball ammo: the workhorse of both World Wars. This one is made by the Government plant, the Dominion Arsenal and features that 'orrible-narsty British-type Berdan primer which is Corrosive and Mercuric BOTH: ruins both your rifle and your brass at the same time! Bullet is the 3-piece impact-unstable Mark VII with a 3-grain aluminum filler in the front end and a recycled lead/antimony core with a cupronickle (85 Cu - 15 Ni) or CuNi-coated mild steel jacket. Charge is about 37 grains of Cordite MD-T 5-2: Cordite Modified, Tubular, .05 OD and .02 ID on the strands. Muzzle velocity was 2440 ft/sec nominal from the LE rifle or from the Bren or Lewis; you could count on another 100 ft/sec from a Ross.
This should give you SOME help at least.
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