Have been breeding Simm x Angus cattle myself for a few years and heavily involved in a large operation that has been making that cross for at least 15 years. Have encountered some inconsistency, as expected, but really have gotten along quite well with the cattle. Genetics on the Simm side of things really needs to be researched before you go hog-wild. There are differences and we sure try to keep the daylight under them to a modest degree while watching rib shape, milk and calving ease. We're not breeding small cattle, mind you, but trying not to throw the baby out with the bath water. This year in a severe drought, running cows on burned up Buffalo grass and quite awhile on wheat stubble I haven't seen a lot of difference in the condition of my Simm x Angus cows and the Angus cows that belong to the man that runs my cows for me. Yes, he does have some smaller Angus cows that are holding their flesh better, but he also has some smaller Angus cows that are not holding their flesh. I have found no absolutes in that deparment, but I have found heavy weaning and yearling weights with the Simm x Angus calves. Mature size is not what most would call small, as I said, but I don't know that it's hurting anything except for creating a standing argument over cow size which has yet to be scientifically resolved. We stick to all homozygous black and polled Simmental and also have limits on carcass quality which we can't afford to get away from. 85% Choice is the average for the big herd that my friend operates, but he's also had some 50% CAB loads in those same cattle. Finish weights are heavy and yield grade is a bit easier to manage. Some of those bred heifers are just pretty darned fancy too. Not much of the extra leather that the old Simmy cattle used to pack around. The Angus component is the common denominator and I'd say that mediocre Angus cattle cannot be made better with good Simm genetics. Selection within the breeds is paramount, and it costs something to pursue cattle in the top 10 or 15% of the gene pool. Labor, semen, bull prices, etc... A lot of fun to keep trying for excellence!