Here we go:
Sorry its a bit blurred it was done in a rush will post better ones in a few but this is the A-10 shell on the left, in the middle is a bog standard machine gun round and note to the right is the shell of the AK47S above.
To give a look on size i placed the A-10 round next to my foot, and its bigger than my foot.
Im a size 10 wich is about 29cm long i think my foot.
But there you have it.