A projectile carries energy based on weight and velocity...a #4 carries way more energy than a smaller lighter weight TSS pellet.
TSS can't be pushed to the velocity lead can because of pressures caused because it doesn't give any.
There's a thing called energy transfer...
The TSS depends not on energy transfer but on the hope that it will poke a bunch of small holes in something vital.
Most any choke will shoot a bunch of small pellets. Usually not so with the bigger shot unless it's coming out of a Winchester Longbeard.
Federal ammo and all the others ammo companies are sucking hind teet with the bigger shot loads coming from Winchester...that's why they're pushing the small shot...pretty easy to see if you've been watching.
The shot lock technology in Winchester Longbeards makes most any choke/gun combination look pretty good.
