Bullets shouldn't be magnetic since they are made of brass, copper and lead, but I guess these ones had enough rusty ferrous material stuck to them that I pulled them out with a magnet anyway.
The little rod below the horseshoe is also entirely made of copper and not all magnetic, but it was held on to the magnet by some rusty scrap.
I also got a fair amount of loose change, and what I think is a door knob that I was a little worried could be a grenade when I pulled it out amongst the bullets.
Steel cased shells shoot like shit in all of my guns. I bought a bunch of them online when the ammo shortages were prevalent over the last 5 years, and they all jammed quite a bit. I wouldn't want to rely on those during a war.