Patti, it's an unfired bullet, which suggests to me reloading in the twins room.

DRH 36 (see colour coding for spent cases / loose bullets in main bedroom diagram) I thought was a fired bullet head (having passed through the body) , as opposed to a spent cartridge or a whole unfired bullet.
How DRH 36 (if a fired bullet head) got to where it is shown is confusing (as with DRH5 in the main bedroom diagram).
In the main bedroom diagram DRH 5, 9 & 35 are referred to as LOOSE BULLETS (all associated with June) - I believe they are all fired bullets (the lead piece only) that passed through her!