I had access to a CZ 452 in 22 WMR that has problems with misfires on Federal ammo. If I would re chamber with the round rotated 90 degrees, it would fire.
I replaced the striker spring with a yodave 10% stronger spring. No more misfires.
Found it easiest to replace the striker spring with a clamp or vise using a steel tire valve cap to push the safety end in (whatever that little black bit on the back side of the bolt is called). Very controllable, and a lot easier to line up.
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