Not arrogant at all. If I accept mediocrity in loading, it is what I will produce.

I have loaded a round and missed throwing a charge in one cartridge. I even missed it on visual inspection but I caught it when I put the completed rounds on the scale. When the round was light by 44.5 grains the error was caught.

I am just a bench loader. The kind of error in the OP for a commercial ammo is beyond scary.