The most common frame size that seems to consistently work out in our environment/resource base, is always under a frame 5. The best seem to be frame 4
or smaller, and weight largely depends on body type. We've had some frame 2 cows weigh 800lbs, and some weigh 1300lbs.
Anyway, to me the more important focus should be on profit per cow, not size of cow. That being said, here's my most profitable beef cow, all purebred stuff aside, talking strictly commercial beef production......................
She weighed 700lbs when I bought her(thin), and weighs 740 now. She's between 42" and 44" tall, making her a Frame 1 at most. That's her natural heifer calf, out of a polled Hereford bull(bred when I bought her), standing 2" taller than Momma.
Some more angles:
Here's another pic of a cow that's my type, and one I have to keep because the grandparents gave her to my daughter as her 1st Christmas present, 12 years ago. Can you pick out which one I like? Any guesses as to which one makes more money?