Cosmoline
Member
Took my new CZ 550 out for a test run through some 7x57 handloads. I've detailed the results below. In general, it appears the CZ 550 has been given a different twist rate than old military 7x57's. Where those rifles tend to do better with heavier bullets in the 175 grain range, the CZ 550 seems to be doing much better with bullets of 150 or 140 grain. I'm going to be working up a handload for the 139 Grain Horandy to about 2,800 fps--the one O'Conner used so much. That should be ideal. I'm going to post some detailed load information over in the handload section.
