My guess is that the wads are a wood fiber between card stock. It could be ground cork, but it doesn't look like ground cork to me.
You know, it could be felt. That was a common wad material at the time.
OK, I think my Ideal 26 is post 1912, because I just found references to "Remington-UMC" primers.
Just found a Du Pont ad in the back that's dated 1916.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.