I would say no max i have got out of a 20 liter pot is around 5-6 oz and the pot was full of root
but i did have the 2 plants under the 600 watt and veg time was only 30 days and flower 60 days
as the old saying the bigger the roots the bigger the fruits but bigger roots take time remember once you switch to 12/12 the root growth slows down and they focus on making fruits/flowers
at the moment my jack herer is in a 50 liter pot and aiming for 8 Oz if i get more i'll be happy but i always think less but always get more
if your aiming for a pound make sure you veg the shit out of that plant but i would up size pot even just up to a 30 liter
but just do it soon so your not all tucked in to your scrog net will be a pain in the ass