Oddly enough, my finding with Remington heavi-shot, (their 1 7/8 ounce 3 1/2" shell), is that it actually produced less felt recoil than the Winchester 1 3/4 oz. 3 1/2" shell I was shooting. Both were #6 shot and the Winchester was a lighter payload. I was pleasantly surprised.

More on what your asking... I have patterned chokes with and without ports and I can't tell much difference, if any at all between the two. The ported chokes I can speak of are the Kicks, Hastings and a stock Browning turkey tube.