years ago we used to go up into Wyoming every spring and purchase a couple of hundred head of weaned hereford calves from a couple of ranchers we were acquainted with. we would either truck them back down to Missouri, or on a couple of occasions brought them back by rail. when we made the purchase, we would ride out on horses and help the rancher round up the herd. they would be out basically free-ranging on 10 to 15 thousand acres of land. we'd sort off what calves we wanted and away we'd go. weaned on the truck. seems like they usually weighed around 450 lbs or so. by the time they got back to missouri- they didn't look like the same calves. of course we had a lot of trouble with sickness, but it wasn't too bad 'cause we'd do it again the following year. grazed the pastures through the summer and sell in the fall.
later on, or more recently - we'd pick up most of our purchases locally. either go to the auctions ourselves, or have order buyers pick them up for us. again graze through summer and sell in fall. some years though we would feed a few on out to slaughter depending on the market. bringing in small runs of calves to group into pot loads had its downfalls though. very easy to bring some type of sickness along with the calves. also, even though we tried to purchase uniform calves - we had a lot of trouble keeping them even. different genetics would result in different performance.
i prefer to raise my own calves- grow my own replacement heifers- and have the option of selling as weaners, yearlings, fats, as replacements, cow-calf pairs, three-in-ones...
ROB