Penetration is not that bid a deal on thin skinned game like a turkey that is hopefully shot in the head that is why people can kill them with small shot like TSS #7s or #9s.
I'm a pretty good shot with a rifle or a shotgun but you shoot at enough turkeys and you'll eventually make a bad shot. When it happens I want a pellet size that I can depend on to smash through meat and bone and immobilize the turkey until I can put my foot on his head.
If Winchester ever came out with a reasonably priced TSS load with "Shot-lock" in a #5 pellet size I might give them a whirl...until then I'll shoot my #4 Winchester Longbeads.
