I've been using a ration that is by no means hot, but I've finished even the most hard to finish steers on it. The ration is:
45.75% cracked corn
20% whole oats
17.5% cottonseed hulls
12.75% soybean meal
1.5% mineral package
1.5% liquafat
1% digestamax
I will tweak the ration in some instances, but most all our steers have been grown and finished on this ration. If you have an especially hard doing steer a bypass fat can be added. Nutrient analysis of this ration on a dry matter basis is:
14.77% crude protein
12.5 % crude fiber
5.17% crude fat
Hope this helps.