i have 590A1 18.5" that has the VCS done to it. I really like the shot control, approximately 10-12" at 25 yards, but one thing that suprised me was the HUGE ball of flash. I suppose that is a given with a SG, but it still was suprising, after shooting ARs with flash suppressors. The flash was much larger than the Garand and SKS we were shooting, which both had crowned muzzles.
I am now shooting the standard Remington 2 3/4" buck, rather than the tactical. This round appears to work well too. the S&B, with the clear hull, spread a little larger.