That's a very good question, I will give you some numbers that the CSA is promoting for the Fleckvieh Fullblood Simmies on one of their Ads.

Based on a group of 155 steers, avg carcass weight: 825lbs - avg age: 479 days -- 59% graded AAA -- no animals in the group graded below AA

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This is an excerpt from Coldstream Ranch in BC, they run red & black Simmental bulls on Angus X Simmental cows. They run 2400 mother cows, here is some numbers from their own herd. I figured it should be a good indication of a Simmental X Angus herd.

"Our calves are finished at Western Feedlot in Strathmore, Alberta. The following is a breakdown of our calves performance in the Feedlot: feed conversion was outstanding at 5.6, with an Average Daily Gain of 3.95 lbs. Our calves sell to Cargill on the Grid Value-Based marketing program, as you can see below from the premiums we received, the results were outstanding. Premiums per head equated to $34.59 per head on the steers, totaling $46,785.04.