I'm not a reloader, but recently just for fun tested the velocites from various loads/rifles with a chronograph.
My 6.5x55 Finnlight 75 (20 7/8" barrel) gives velocities well below the manufacturers data; unsurprisingly perhaps, as the test barrels quoted for that calibre often seem on the long side (esp. RWS!).
It certainly came as no surprise to me, as Thar's (I think) wise words on the subject elsewhere that made me particularly want to try the experiment.
RWS 127grain book (25.5") 2900fps measured 2550fps average
Norma 140grain book 2690 measured 2520 av
Norma 120grain book 2822 measured 2700 av
I note with interest that the 85 Finnlight has a about 1.5" more barrel than mine in 6.5x55.
If I were to start reloading, would there be some remedy for this loss of velocity without exceeding maximum pressure, perhaps by use of a kind of powder better-suited to efficient burning in the shorter barrel?