Before I knew it was not recommended to shoot these with ported chokes, I shot one shell (HW #6) through my .555 ported choke. It was only at thirty yards but it was a really good pattern(180 in 10"). I've heard that some have been having catastrophic results with this shell/choke combo. But, I've also heard that the 20g uses a softer wad and that it is ok. I've got other combos in this gun to shoot but this put up the best pattern for me. At least at 30 yards.
So is this safe to shoot? The last thing I want is my choke to blow up with my 9 year old daughter behind the trigger.