I am sure that not all toaster ovens are created equal. I discovered that my thrift store oven had some significant hot spots - I had coated a number of different bullets with a small number cast out of straight linotype. Once the oven had cooled and I removed the bullets the linotype bullets in the far back left corner had slumped while the rest didn't.
I went shopping for an oven with a convection fan - no more hot spots and no more slumped bullets.
