When it starts becoming "work" maybe you are done. But yes, cheap thrills!
If barrel 3 with the cheap BBs is "good enough" maybe stop there. I see it did "even better" with the pricey BBs, but not enough to warrant the expense (unless EVERY point matters.) I also considered you might re-run an earlier set of 50, to see how consistent the results are -- before going further -- to see what kind of error window you've got.
About the magnetic tip, I wonder if the BB is always exactly centered on it, or sometimes a hair high low left right, affecting it's initial path. Yes, I'm absolutely splitting hairs.
And on the subject of splitting hairs, I usually look at the MOA column rather than mm, since it has finer resolution. If you set the TARAN file up with imperial units, you get 0.01" resolution, about 4x finer than 1mm. I looked at the underlying code to try to get it to display in 0.1mm, but javascript is not a quick learn, and it appears to be generating an SVG graphic, not simple text.
@beerthief I think these 499 barrels swap pretty easily in a 499. I don't think other Daisy springers would readily fit a 499 barrel, but I bet someone out there has probably tried it. I removed (unscrewed) the 499 specific ends, and fit the bare barrel tube to my Daisy 35 for some testing, with a 3D printed adapter in-between. The pump up Daisies have the barrel pre-fit into the receiver, usually sold as a complete assembly, The barrel is removable from the assembly, but not as trivial as just unscrewing -- some heat is required.
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