Maternal powerhouse simmental cattle can (not necessarily will) always turn out good clubby calves. Make sure they are structurally correct, even a little too soft, big and soggy, and something you can work alone that won't kill you when you tag calves. cdn nailed it on the head. If you can find some nice think angus cows they would work well too. I like a mix of purebred mamas and you can have a nice variety of calves. We keep mostly purebred mamas and breed mixed cows to purebred bulls for the predictability. I personally like in this order simm, char, simangus, herf/angus, maine/angus cows for mamas. Simm/maine are usually a good bet for your calf crop