I am not the smartest handloader so be careful

my magazine on the CZ550 is extra long, 3.47"; and apparently a long throat to match, came like that from the factory

so I am loading to 3.44 OAL to fit more powder and lower pressures

It gives it kind of a Creedmore look

So with that said: magnum primer, 68g r17, 3.44 oal, quickload calc'd pressure just under 62k

I started ladder loads at 64g, all the loads grouped less than 1 1/4"