This i think are from bombshell! (1st and 2nd)
That i think from airplain ammunition! (3rd)
And this i want to ask you,is a german bullet ,the colour is black and on back wrote 44 and are two cross gun. (4th)
The first 2 pictures are fragments of the sabot these brass pieces went around the projectile. I've never seen them such complete tho..
The big casing is probably. A airplane casing or maybe some small anti aurcraft gun.
The small casing is probably from a german k98 aka mauser. I've found lots of them.
In the picture you can see the sabot at the bottom of the projectile.