RE: order new 835?
I could be wrong in this but I thought, among other things that the porting was used to grab the plastic wading and slow it down as the shot exits the barrel. This way the plastic does not bump the lead shot distorting the pattern, as the plastic which is lighter tries to pass the lead once out of the barrel. This is supposed to give you a better, tighter long range pattern. I am sure that some of you other members with more knowledge on this can confirm or dispute this. I have not actually tested this to see if it is true just something I was told by another hunter.
Tim