They discuss it time to time on the nice forum where all the smart guys hang and only hugs are given. Some there say this
First off: I am not a believer of going out and having your old barrel ported. But---I do like factory ported barrels over non-ported barrels. No it does not change your guns patterns or improve them, but when shotgun barrels are properly ported they do reduce barrel jump and help with follow-up shots in 2 shot games. IMO they even help with a single barrel shotgun as well, because of the reduced barrel jump, you can keep your head on the barrel longer to see the target breaks. Otherwise many shooters can get in a bad habit of lifting there heads right after they shoot to see the target break better. Often times this results in the shooter lifting his/her head just before they shoot, and we know what the results of that are. Also the porting makes no difference at all in cleaning the gun, as long as your wiping the gun down after your done shooting. I notice no difference in noise at all in a ported gun "While I'm Shooting". Sometimes it is more noticeable in the shooter next to you depending on the loads of that shooter. But this is a slight distraction at best in the worst case scenario.
Also on a side note: Most Trap shooters (mostly the older crowd) dislike ported barrels, while the majority of Skeet and Sporting Clay shooters find them very helpful. break em all Jeff
IMO many cannot notice the difference if it hit them in the face. The same ones when you say the shot string was behind laugh and say sure like you seen it
Mine would gather a little more buildup of the wad but that was about it as far as harder cleaning