Hi, I make my own mixture of oats, wheat, BOSS (Black Oil Sunflower Seeds), and, now that it's getting colder, corn. I don't really measure it but I use a quart sized yoghurt container and measure out equal amounts of whole oats and wheat. I'll put about 12 scoops of each into a tub, then about two scoops of BOSS and just recently one scoop of corn. I'll increase the corn as the temperature decreases.
I distribute about 3/4 of a cup to six birds an hour before dark so they have full crops. They eat most of it then but sometimes in the morning there's a few grains left.
It took them a while to get used to the BOSS, and now they're feeling the same way about the corn, but after they got the taste, it's the first thing they eat. They don't leave any behind.
Mary