I have never seen powder granules like that semi spherical to oblong and flat shapes almost looks like a duplex loading he does another vid where he pulls 13 rounds (Bakers Doz) alarmingly one round was 10 grains under the others which varied a bit but around 41Gns.
That 10 grain under could set up a EE event where the flash goes across the top of the powder column as it sits below the primer hole instead of starting from the rear, so you get more powder instantly lit setting up a bad detonation as that's what I called it after happened to me.
The action held and only the case ruptured I was using 760 ball powder very fine grained and a light load in my 6.5 x 284 now I keep my densities at 85-90% bit more recoil but much safer for me and the rifle oh and bystanders!