Most PRS rifles are short actions.
However, don't let that stop you.
The answer you seek is either the 6.5-06, 6.5x57 or 6.5x55.
6.5x55 factory ammo is available, however, it is loaded at extremely low pressures with safety in mind for the old Krag-Jorgensen and model 96 mausers.
It can be loaded quite a bit hotter, but, due to the taper, requires regular trimming.
The easy button is the 6.5-06. Quality brass is plentiful, no need to hot rod it.