Dan, since speed is your concern, you need a measure that mounts on the expander die and dispenses powder through the expander. That combines two steps in the loading process. You can do this with a Lee expander and a Lee Pro AutoDisk to do it automatically, or you can mount RCBS and Lyman measures by means of the Lyman Universal Expander Kit and do it manually.
The Lee does a better job with very small charges, but has to be watched for hangups. The calibers you are shooting take large enough charges so the RCBS will work fine.