Originally Posted by RickBin
Familiar with KPY shotgun ballistics program?

Real quick:
1300 fps
1 1/4 oz shot charge


Chilled lead #4 (167 pellets)

@ 60 yards:

Final Vel: 582
Energy (ft/lbs): 2.45
Energy Density (ft / lbs /sq in): 184.8
Gel Penetration: 1.72


TSS #9 (447 pellets)

@ 60 yards:

Final Vel: 577
Energy (ft/lbs): 0.90
Energy Density (ft / lbs /sq in): 179.6
Gel Penetration: 1.67


Contemplating these numbers will lead you down all sorts of paths regarding the relative merits of TSS. You can make of these what you'd like, but here is one take:

Individual #9 TSS and #4 chilled lead pellets are as above @ 60 yards in terms of lethality. The density of TSS allows you to have 267% more pellets per shot charge, or to shoot lighter/faster charges (increasing energy), or both, or duplexing with steel loads, or, or or ...








I like 267% more pellets. More pellets = more dead.