Chuck

Whilst not a CZ in .500 Jeffery, I have a rifle in that calibre that uses Kynoch ammunition, feeding did have to be set up initialy but works just fine, with staggered magazine column it feeds perfectly from both sides of the column with soft and solids, the Kynoch case is made to the current CIP standard and uses an industry standard in the woodleigh softs and solids so there should really be no ammo related feed problems.

It could well be your rifle needs some small amount of after work on it. The Jeffery calibre has an unfortunate reputation for being difficult to get to feed but once sorted the problems seem few, it does sound like a trip to a competent riflesmith is in order.

Good luck

Jonathan