Some of my older manuals speak of using random things as a filler on lead bullets that would also eliminate the need for a gas check as they keep the gas off the bullet base.
I have also since read that using cornmeal and whatnot can cause ringing, which I understood as a chamber bulge forming because the cornmeal compresses before it starts to move the bullet and pressure jumps and causes a bulge. (If that is not correct please let me know.)
As I intend to soon start loading low-powered LC 308 rounds, I would like to find some sort of filler that would not risk degrading my firearm.
The idea of needing to point the muzzle up so that the powder falls to the back of the case is incredibly unappealing to me.