I don' t have an answer to your question about which choke to use or not, but, I am guessing that this " Hevi-Shot" is a steel replacement for which I do not have much use for in the turkey woods. I have heard mixed reviews on the use and cost of these steel replacement loads, whether it is worth the price or not. Waterfowlers sometimes buy into the fact that it makes for better kills in the field, building a false sense of confidence that later may and has led to trigger more long range, lower percentage shots being taken, instead of sound range judgement. I personally have seen 2 of my buddies taking 75 yard shots at passing waterfowl on the Missouri River, getting lucky enough to drop the last bird of a 6 bird flock, then admitting that they were leading the front bird by a great distance, then, giving me slack for not shooting at all.
I know that some of these loads may have greater velocity, knock down power, ect., but I think we are getting to an age of replacing common sense with the all mighty dollar and advertising campaigns.
If the load you are speaking of gives the person using it better patterns when the right choke is in place, good, use it, I say to each their own. I just hope it doesn' t turn many of us into " Quigley' s" with a shotgun.
Just my opinion....I could be wrong.........