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Grooves in a modern firearm..

are .002-.004 or a max of .006 in depth. Land to groove depth isn't very much in modern rifles. I don't know exactly what CZs are, but this would be a good estimate.

The less of an impression on the bullet the better. CZ does a very good job on the rifling and chambers for a mass production facility. Hammer forged barrels aren't what target shooters prefer, but CZ hammer forges the chamber which is very good because it doesn't leave tooling marks.
 
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