I did exactly the same thing last year. I purchased a WC MK3 VP and then substituted a 480cc bottle. In my case i also then went down in size to a 500mm barrel, since I really wanted a compact but with a big barrel. It is now a .25 cal compact which, with the FX Maverick/Wildcat slug kit, gets the Zan 37 grain slugs moving at 894 FPS and delivers almost 66 Ft Lbs of energy at the muzzle.
I’m actually thinking of going back to the 600mm barrel soon. Why? No reason really. I just like playing around with my guns and the beauty of FXZ rifles is that it is really easy to change things up and makes me feel like I have a new gun
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