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400 with a .2 IS 1.48 J it's easier to remember and understand 400 fps as a limit though. Everyone should technically be chronoing with the weight they are shooting in order to determine they are actually under a predetermined limit. It's just easy to do with .2s because they are cheap. However, as you see with your .33s, it doesn't scale in a linear fashion due to science.
you cannot exceed 1.48 J with ANY weight.
If you are shooting higher J with heavier weight then that is an issue and your gun will not make chrono as it shoots over the limit. The fps at .2 is irrelevant. It's the Joule it shoots with whatever weight you are going to use that has to be 1.48. (if 400 is your local limit)
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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