Chris.
A wad stack is very important. As much as the right primer or bullet shooting a PP bullet. Wad stacks don't effect a greaser to much but it does with a bore diameter PP using a soft felt or cork if you don't get the bullet hardness balanced so it fully upsets to fill the grooves or chamber wall to seal the gas behind the bullet to keep consistent pressure driving that bullet. This can cause the unexpected dirt diggers especially if the leaking gas cuts through the patch and hits the bullet.
The results are plowing dirt or one going from the X to wood splinters hitting the target frame.
They will make you scratch your head when the unexplained dust cloud kicks up for no reason at all.
Kurt