If 23 inches is max for the .204 with it's much larger boiler room then even 23 inches is too much for the .20VT. When I built mine and considered exactly this topic I figured 22 inches would get all of the .20 VT's case capacity, if the max length in the .204 is 23 inches even my 22 incher might be a bit too long in the .20 VT. Keep in mind it isn't all about velocity, if velocity in and of itself is the main issue get a bigger case, it's easily handled.
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montdoug
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