Not sure if you have any personal experience with 1903 Mannlichers (the rifle most affiliated with this cartridge), but they can be pretty finicky in regards to ammo, not only in regards to accuracy but also when it comes to feeding out of the rotary mag. They tend to group better with the heavier, 155-160gr.-class of bullet, and generally feed RN bullets more smoothly than spitzers. Also--COL is critical to feeding with these guns--keep in mind that most if not all 1903's won't feed at all if the COL is less than 3", which means you can't seat to the cannelure on many 6.5 RNs including Hornady. You didn't list them as an option but I would also be interested in the 159 gr. RWS H- and T-Mantles.

Best of luck!
Malcolm