I think most of the points raised are valid, and yes, a given barrel will be better suited to certain pellets. That said, the tuning of the rifle may often make the critical difference in getting a certain pellet to shoot well. Of course, for a specific purpose, we often want the velocity to be within a narrow range, so the ability to adjust that variable may be limited. I've heard enough reports from experienced shooters about the importance of head diameter to make me believe it matters. Personally, I'm too lazy to test that particular variable, and all my rifles seem to shoot pellets of different head sizes with no easily discernible difference. And frankly, I've done some measurements of pellets with a head size designation, and found them to vary a fair amount. So, to really know, you would need to sort by actual measurement and then test, not something I'm inclined to do. It's one of those things that a serious BR shooter would probably want to do, but for all practical shooting needs, not necessary. But, testing pellets by brand, style, and weight is definitely worthwhile, and not such an onerous task.
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