Whatever you do, resist the urge to keep BIM heifers as cows. I have a deep bodied Walks Alone x Angus cow with her second calf on the ground now and she is a great little cow, heavy milker and is as maternal as any of my Angus cows. She weaned off at over 50% of her body weight as a heifer and bred back AI.
I figured her 3/4 sister born the next year out of the same cow and BIM would be similar. Not similar at all. The little sister by BIM didn't take care of her calf til about the 4th day of being locked up in a calving jug and barely milks enough to raise her calf. Another BIM heifer out of a very maternal, heavy milking Simmental x Maine cow doesn't lick her calf at all, doesn't really care if it is around and certainly never goes looking for it, and has virtually no milk. Her calf gave up and has been stealing milk. Locked the up together today to see if I can figure out whether she is going to work or if she should just go right to the feedlot and bottle feed the calf. The BIM cattle seem to be bigger, raw boned, hard doing heifers compared to the Walks Alone cattle we have had.
I have one more yearling BIM heifer that is out of a very angular maternal commercial Angus cow. This one is actually much softer bodied, easier keeping and reminds me of the Walks Alone cattle rather than a BIM. I will give her a chance, but I am pretty much done with BIM. I can't imagine how you can ever get a steer fat if the heifers are any indication of how he breeds.