Just to clarify-my understanding is the 455 and 457 barrels are all the same. I found it moderately useful to play with a few barrels to identify the best-it’s the luck of the draw with CZ and some shoot much better than others. Also if one has an unusually well figured stock and tuned trigger it makes it more worthwhile having switch barrel capability. But ultimately I’ve kept the older 452 and moved to high end Anschutz bolts and 10/22 clones.
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