Congrats to your CZ 550 and the 9.3x62.
I use the 9.3x64 and since a year now, the 9.3x62 with a 20" barrel ,as well.They sure knock them down.I have never used the Partition in either gun, but no matter what i use, they all seem to shoot.With the right bullet and the right scope,even 300 yds is not a problem, as long as you know your ballistic.
Good choice,bud.