Autos used to be considered less accurate than bolt actions and that may have had some impact on what hunters buy, although, I don't think that practical accuracy in the field was ever sodifferent as to justify picking one over the other. I doubt that bolt actions can be "manufactured more precisely." Seems to me that with technology as it is in the gun industry, either can be made with the same level of precision. So, cost is probably the biggest issue as autos are generally a good bit more costly than comparable bolt actions.