I found the Prvi 120 gr match 6.5x55 to shoot pretty decent for me.....much better accuracy wise than the standard 139 grain Prvi ammo.

As to Grafs and its Lapua 6.5x55 ammo. I bought some of the 123 gr ammo, due to its velocity being listed at a little over 2700 FPS, slower than most of the Lapua 6.5 Swede ammo had to sell. It shot quite well for me when it came to accuracy. Check Grafs for its Lapua 6.5x55 ammo. Shows the velocity of each kind they sell.