This site details the conversion of an AR auto to 6.5 PPC, basically an improved 6.5x39. They get very respectable velocities from from a 26" barrel for such a small case. I considered this for a mini mauser actioned custom, but have mostly settled on a 260 Rem Ackley Improved short-reamed to 1.75" case length. I'm hoping for around 3100fps/100gr. from a 23" barrel. Sounds like we're looking for similar rounds. What rifle are you planning on? A Sako A1 or CZ 527 would be perfect for your cartridge.