Sion's Q does not do the damage it should
When you fully charge Sion's Q, it doesn't seem to do the damage it should. I thought I'd build the damage to clear minion waves in 1 q. It said that at max charge, it would do 300 + 395 damage. This, according to my calculation, would be 695 damage without any extra's and such. Ranged minions had 500 hp, 0 armor, 0 magic resistance. Yet, my fully charged Decimating Smash did only 407 damage.
Now, I realise that his Q only does 80% damage on minions. However, 695 * 0.8 = 556. The minions still should have died.
I'm not being extremely stupid somehow, am I?