[Retlaw]

Originally Posted by DaveinGermany

Look like 7.62's & 9mm standard SLR, SMG & Browning rounds all prior to the introduction of the SA 80, mid 1980's using the standardized NATO 5.56mm round, Mind you the jimpy (GPMG) still used as a fire support weapon & is 7.62mm.

The army did fire a lot of the early 7.62's up there, some of it was made by Greenwood & Bately, but they lost the contract.
7.62 cartridges made by Greenwood & Bately are now collectors items.
If your lucky you might find some .280's, that was tried as the new British calibre, before Churchill went along with the septics, who wanted the 7.62 to be the standard round, which was a shortened version of their 30-06, known as the .308 Winchester.