I've got a Uragan 2- 700mm. I couldn't believe how enormous the Uragan 2 looked when I first unboxed it, I'm talking bulky looking as in shroud/bottle diameter (full disclosure - This was my first bottle gun). I believe the Vulcan 3 has an even larger diameter bottle and the shroud is the same diameter as the Uragan 2 (I believe?).
What strikes me about the Epic 2, is the weight, And I consider weight to be an impediment on a hunting gun. The Epic 2 - 550mm is even heavier than my Uragan 2 - 700mm (slightly anyway). I'll take a weight penalty for a blind or stand hunting gun, But when I consider an ideal hunting airgun, as in walking around and shooting stuff, weight is definitely a consideration.
I was impressed with the sticky above with 1791 shooting a 700mm Epic 2 ('All Hits'), a big WOW as far as accuracy/consistency, but then I searched and found several reviews where some of the guns had issues (maybe I could find those for the Vulcan 3 also?). From my perspective, if the Epic 2's issues(?) are ironed out, and the riffles are as consistent/accurate as in 1791's review, weight be damned... I'd be looking at one.
I'm into PCP's for pellet shooting only, but after watching the above video (All Hits), I could see PCP's (with slugs) possibly replacing my 22 rimfires not too far down the road... for fun and hunting.
Jerry