Whats this Cartridge

[CINDERS]

Thought I would have a guess the cartridge ? The one on the left is a .5 BMG what is the one on the Rt and what was it used for. (I sorta know what it is but would like to know if I have it right)
TIA

In case you do not know what an ONTOS is (Latin = Thing) armed with 6 recoiless rifles so here is a picture of one apparently when they cut loose with the splintex round it devastated a rather large front. I read in one report of the affects this weapon had that the darts had penetrated the receiver of an AK and pinned it to the VC's chest. The only issue was they had to retire to reload the weapons after expending them........

The third pic is Top - Mk VII 303, Middle - 3" or 3.7" ? Rocket Dart, Bottom - Splintex dart

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