im pretty sure the norm or average for autos is around an oz dry, I'm not saying they cant yield more than an ounce per plant because i've seen it.. but lol at 400-500 grams, only way to see that number is off a bunch of them in a sea of green ya of course you could get that yield, just please dont ever expect 400-500 grams off any single plant, even off a non auto! we all have high expectations but thats just ridiculous. breeders usually calculate their yields per square meter, im thinking maybe thats what u read?