I understand TSS in a 20 ga and .410. If you are using it in a 12 ga it is because you are wanting to extend the range. Plenty of non TSS 12 ga loads good for turkey at 40 yards plus. If you are shooting turkeys over 50 yards, you are missing the point of turkey hunting - in my opinion - of course.
Spot on! This is what I've said from the start
TSS in a 12 ga is wasting shot. The 12ga has enough capacity for lead 5's to do just fine.
Where tss shines is in 410 and 28ga. I love being able to run and gun with a 3.5 pound gun that has no recoil and is more lethal than 3.5" 12ga
As far as chokes go I've shot somewhere around 5,000 rounds of tss loads and haven't ever messed up a choke. The chokes that say no steel are saying that because most steel shot is large pellet sizes like BB or #2. Small tss shot like #9 will not harm these chokes
I killed both my NC birds this year with my beretta 28ga and its factory full choke. TSS 9's