Old post, but I am new to the forum, have an interest in this and will comment and discuss: Yes, I think a stiffer wad will help contain the shot and make a tighter pattern. I have not used the TUPRW wad but am looking at the Ranger Elite wad for some turkey loads. Also, the Ranger Elite wad comes in slit and UNSLIT, which can make a difference so, I hear.
Also, I have done some research on using buffers, which help keep to pattern tight and are described as:
"Buffered loads produce superior, more consistent patterns by reducing random pellet to pellet influences during setback. Each pellet is embedded into a protective cushion of buffer."
I am looking am doing some load development using #6 shot, my favorite and have been reloading, shotgun, rifle and handgun for many years (40+ to be exact), am a former competitive shooter in skeet (A class), and Service Rifle (Master).
Here are the links -
https://www.ballisticproducts.com/Advantages-Manual-12th-Edition/productinfo/00MADV/https://www.ballisticproducts.com/Ranger-Elite-12ga-Unslit-Wad-100_bag/productinfo/32212REUS/Interested in other fellow shooter's experience for those that reload.
Thank you and tight groups.
Fletcher (swampfox62)