So by "lengthening the forcing cone" they mean to make the existing improved cylinder longer inside the barrel? Can it be achieved just by attaching a tighter choke?
The forcing cone is found after the chamber of the shotgun, whereas the choke is screwed into the end of the barrel.
Lengthening the forcing cone basically condenses the shot column/pattern more gradually and for a longer period of time than a regular forcing cone or a choke.
Patterns similar in spread can be acheived through use of different chokes, but the advantage of the VCS is that it can also process slugs.
I have no idea how tight of a choke I'd need to match the performance of my VCS, but I think it might be too tight to accomodate slugs...
Accuracy with slugs is also (marginally) improved through the VCS barrel.
Obviously different guns cycling different types/brands of ammo will produce vastly different results.
In that aspect, each shotgun is very unique in the way it patterns...
The other advantage to the VCS barrel job (though not mandatory for patterning performance) is the ported "business end".
As far as muzzle flip reduction & recoil go, it does help somewhat. But hey, we are talking shotguns here =)
I view the VCS barrel as an investment worthy of commitment
once the shooter has begun outshooting the firearm in its' basic configuration.
I poured heaps of buck & slugs downrange before committing to the VCS barrel, and I personally believe that the experience I gained with a stock(ish) shotty is what allowed me to truly appreciate the benefits of the VCS upgrade.
Questions for you ColdBlood:
Which autoloader are you thinking of purchasing?
Why an autoloader or a pump?
Gh0sT~