For what is worth, my flock is a bit more than half yours (see signature, below) with no geese or turkeys. I've been working on my free range pasture, and have a lot of work left to go. I'm also in a more forgiving climate, though my soils may be much worse (that is, there is TREMENDOUS) variation in range quality from person to person.
I'm currently feeding a bit over 200# a month - but was feeding 50-60# more than that in February. When things peak, I might get down to just 185# a month or so - we'll see if any of the sorghum and buckwheet survived into this year. My prarie grassses (scribner's panicgrass, mostly) is already starting to seed, and I've seen three of my four clovers already this year, for reference. Plus both flax (blue, toad).
As to the pasture, I'm spending what it seems to save me in feed costs each year back into new seed - so technically, I'm not "saving" anything, I'm investing for the future. But I do throw about $150-$200 worth of seed at it each year to see what will establish and persist.
If I were to pretend my Pekins were chickens (and they aren't, they eat a good bit more), and we estimated the current flock size as 50, at 7.5#/bird month (1/4# per day x 30 days) I should be going through about 375# of feed each month - so I'm already in my best year ever. My first year, savings were between 10% and 25% across the seasons, never got below 300# of feed a month.