does porting affect hunting velocity??

[JimHnSTL]

let me say that i bought the chokes based on pattern performance only. it wasn't until i shot a o/u back to back at two targets did i realize this. again while their was a difference in my book i really think that it has to do with the higher pressure loads. i'll have to shoot some regular loads out of the same gun and see if there is a diff. (noticeable)