What about a 6.5x47? There's one listed. I do not reload but have a brother and friends that do.
6.5x47 is sweet but one of the last places I would look as a dependent.
308 Win is a much better way to fly until you begin to roll your own. `
One can purchase quality factory ammo for most of the cartridges listed thus far but with decreased availability, selection and higher prices.
K.I.S.S. Either start reloading for what you currently have and move into something new / purpose built... Or get something sufficient for the task with availability (like a 308, 30-06,
270, 243) and eventually work into reloading.