In reply to:

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IT IS THE A-SQUARE AMMO that is causing me fits

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Maybe not.
If your CZ has the same cutaway on the right side of the chamber as the 602 which is there to clear the extractor, this can cause problems with round nose softpoint projectiles.
It tends to be sharp at the edge and can catch in the soft exposed lead tip and create feed jam problems.
Pointed bullets are usually ok.
My 602 458 used to feed hornady 500 RN softs fine but would often jam winchester round nose softs as they had a bit more area of lead exposed than hornadys.

My advice is similar to others here which is to get a pro to sort it out for you, especially if the rifle is to be used for serious hunting.

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