Good post! I just read your post. I had bought the same FX DRS Classic 22cal 600mm and bought the larger plenum. I had the same results you did. Mine came shooting the same exact power yoursdid. I just wanted more shots and that was the only reason for buying a bigger plenum. I'm going the route of the carbon fiber tube next week. I really like the concept of this airgun being lightweight and was just trying to maximize shot count. I thought the 600mm might be a little long, but now that I have it in hand I've changed my mind. I wouldn't mind having another one in 700mm in .25cal shooting light slugs. I think with the synthetic stock and carbon fiber airtime it would be really light weight.
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