My experience with Czech firearms has all been pre-660. My first one was a 7X57 light rifle based on a G33/40 military action, and I love it. It has made one trip to Africa with me and killed all sorts of plains game, up to and including wildebeest.
My second one was a BRNO 602 in .375 H&H which I took on a driven game hunt in Bulgaria in 1970 and missed out on a shot at a running boar because of a fumble with the safety. I still have that rifle, although in the mean time it has been transformed into a .500 Jeffrey by gunmaker Lon Paul, who also replaced the rather garish, Weatherby style stock with a CZ 660 model and the safety with a Model 70 type. I have shot nothing but paper with it, but am satisfied that it would do the job in Africa when called upon.
I grew up at a time when it was possible to assemble a useable varmint rifle with scope for little more than $100. When buying a rifle, it was normal to look at it as what it could become rather than what is was at the time. The idea of taking a rifle out of the factory box, installing a scope, sighting it in and taking it hunting was one which didn't occur to me, and still doesn't.
I look at a rifle not on the basis of what it is, but what it can be. My go-to dangeerous game rifle started life as a P-14 Enfield and ended up barely recognizeable as a handy little rifle, weighing 8 3/4 pounds and chambered for a cartridge I designed myself, based on a shortened .460 Weatherby case opened up to .505 caliber and firing a 570 grain bullet at 2150 fps. I am satisfied that I could have done just as well with the BRNO, had it been available at the time.
Anyway, this is my .500 Jeffrey, and I couldn't be more pleased with it: