I think that have winner with GECO 9.3X62 PLUS 255 GR!!!

Gun: CZ 550 medium lux 9.3X62
Temp.: 13 ℃ degree celsius
wind: 2.5m/s
light rain

bullet-GECO 9.3X62 PLUS 255 GR
brass-GECO
powder - Hodgon Varget -61 grain
Primer: CCI 200
COL-3.291``
result: sub moa
Vo= 2539 fps/774 m/s
chronoed with magneto speed.

That is FIRST ever ammo in 255 gr that my rifle shoot sub moa!