I'm pretty sure you can get it written as to shoot over 407 fps. As they need to shoot over that speed with ( IIRC ) .22g bb's...which I've yet to see...
Now if they are asking for the 1.9 joule area it'll be easier to reach that with the 8mm bb's anyway as they won't have to go as fast to reach the joule limit. A .34g 8mm bb only nees to go ~ 345-350 to reach 1.9 joules.
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