How long is your barrel?
What is your OAL your CZ will like?
I use 286 partitions at 3.44 oal in my CZ 550, 20.5” barrel
If you can afford a buff hunt you should be able to afford quickload
What is the max pressure you want to run at?
56k is the spec’d pressure
Some guys are running at 60k (+p) some 64k (+p+)
A 270 max pressure is 65k for comparison
Based on a 24” barrel length I think you can get there right at 56k
I have had Very good luck w R17 in the 9.3, loaded between 52-64k psi depending on application in a CZ550
There is some concern with temp stability, one study on a different caliber shows 1fps per 1d F so you want to optimize your load to the anticipated temp. Hence test loads on an 80d day if you predict 80d temps. Don’t leave the cartridges laying in the sun at the range, then load and shoot.
With 286g partitions, 3.44” OAL, 20.5” barrel, 52k psi (calculated)r17, I am getting 2500fps for comparison, Much less than 1” groups on a factory stock CZ550, that is my go to load, I have loaded hotter but groups open up
