If time is a premium and you would rather spend it at the range, I would consider this:

Don't buy a different new rifle shooting a different caliber than your 6.5 PRC that you intend to actually use. Use that money to buy more of your chosen ammo for that 6.5 and go and practice with that. Shoot it at various distances and wind conditions from actual field positions, not just from the bench.

A different rifle will handle differently, trigger will break differently, trajectory and wind bucking will be different, all not conducive to having limited time on the range. Save your brass, you may reload one day.

Good luck with your decision and practice.

Regards,
Manny