One thing to consider, is that the dies wear out after a time, so brands like Air Arms that don't sell as fast as JSB, might come out "cleaner and less deformed" for a longer period of time... because their dies haven't worn out yet... they just get less use.
I've always used the AA .177 cal 10.34 and in .25 cal the 25.4 gr. because they seemed a little cleaner and the skirts seemed a little thicker and less deformed on average.. and they are less expensive... and usually in stock when JSB is out of stock.
Different lot numbers can shoot differently, no matter what the brand... that's one of the things that makes the game so fun!
Wayne
I doubt the factory dedicates dies specific to each brand...that would only further feed misinformation.
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