Definately check your market. I don't want to step on toes - but - in our area, anything that looks like a Hereford is pulled out of the group & sold seperately because the buyers pay less for them. If left in a group, the whole group suffers lower prices.
It's so bad, our extension Beef advisor, stated at a meeting, that if anyone is using a Hereford bull, they are losing $50/hd at the sale barn. Now that's pretty bold & we talked to him after the meeting. He had all the stats in his possession if anyone challenged him on it.
So, if you're in it to make money. Rethink the Hereford bull, and I'd be careful with the Charolais for calving problems. Braunveih would be my choice out of the three. They kind of intrigue me. Look like a real beefy Brown Swiss.