I've never compared the Bisley Magnums to the older Baracuda personally, but have often seen it stated that they're the same pellet. Similarly, I've often seen conflicting information about the similarities between AAF and JSB Exact. Some saying they're exactly the same, just rebadged. Others saying that there are slight differences, whilst even more have said they're essentially the same but the "spin-offs" are allotted their own die? Really not sure.......
As you say, if you have healthy existing stocks, it might be better to just test with the ones you have for now and, occasionally, add a fresh one for some testing. From what I've seen in the past, I wouldn't be placing too much credence on the stated pellet size on those JSBs - getting the right batch seems to be far more important.
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