I just returned from hunting Sandhill Cranes, Canadian Geese and Speckled Belly Geese with Federal TSS BB & 7, 3" shells, (steel BB and Tungsten #7) here are my thoughts....
I was using my Beretta 686 with extended long range chokes. We were shooting over decoys and the way the spread was set so most shots was 35-60 yards, most were 40-45 yards. There were 5 of us in the group. I was the only one shooting TSS.
I used up my 10 box of TSS and then started using Bismuth #2's for some comparison.
Here is what I like....
TSS hits like a hammer. You still gotta hit them, but when you do, they know it.
My first bird(s) with TSS was a double on cranes at 40 yards. Both birds were smacked down and piled up dead when they hit the ground. Canadians and Speckled Bellys were even more impressive with feathers flying. I did not have a wounded bird on the ground with TSS.
I hit a Speck at 60 yards going away fast and the bird piled up dead. It was a shot that likely would not have been successful, or would have ended with a wounded bird if using straight steel.
I like bismuth and it hits like the lead of old. TSS is defiantly another full step ahead.
Here is what I don't like...
Yeah the price. Even the mix Steel/TSS was 7$ a copy. That is not a big deal if only shooting a few rounds ( i.e. Crane limit is 3 birds) but when you start also chasing other folks wounded birds across the field I strongly suggest carrying some steel so you can switch out for those kill shots. I spent approx $28 killing other folks birds on the ground.....
The meat loss is also a concern. TSS hits hards and with that there is lots of blood shot meat. When we cleaned birds shot with TSS there was a significant amount of blood shot that I don't see with regular steel at those ranges.
In conclusion....
I am going to continue shooting TSS when I need it. But, I am going to try and be smarter about it by mixing in bismuth and steel. Probably going to start using Bismuth in the first barrel and TSS in the second with a pocket full of steel for kill shots.
If/ when TSS price comes down around the the cost of bismuth I will use TSS, but I am also going to go down to a 20 ga for the convenience of a smaller package that still hits hard and reduced meat loss.