In the early 1950s, western genre movies where popular in the united states but with the demise of the Colt Single Action Army production prior to WWII so to meet market demand Ruger designed a similar form revolver. The resulting Ruger Blackhawk proved very popular with its cowboy wild west styling yet more modern materials and parts and available in a variety of more modern rounds including the new .44 magnum. The Super Blackhawk was a variant which included design alterations like the larger grip, longer barrel with no fluting and using steel instead of aluminium all in efforts to specifically better handle the .44 magnum round.
The Marushin X Cartridge system makes use of a gas reservoir in the pistol grip charged through the valve port on the bottom but stores BBs individually in independent shells which are manually loaded into the chambers. Storing 6 shells just like the real thing, this enormous revolver cranks out 6mm BBs at around 300fps which is incredibly powerful for an 6mm revolver.
In terms of an 6mm 330 fps vs a 8mm 300 fps, this 6mm weapon will have a flatter arc then the 8mm but the hop-up helps make it very accurate at short range. At 330 fps the pellet moves distinctly faster then the 8mm weapons but will make just as powerful an impact on someone anyway. We're glad that Marushin have come out with a 6mm BB alternative as 8mmBBs are hard to come by.
Large, imposing and powerful with actual shells cranking out 6mm BBs; if you ever wanted to add that obligatory big scary revolver to your collection then your best bet is a Marushin X Cartridge 6mm and the Super Blackhawk is a forefront contender for big and beastly.