I ran calculations of 7/8 oz. #8 and #9 chilled lead at 1100 fps in KPY shotshell ballistics program to determine distance required for 1.5" penetration into ballistic gel.
#8 at 29.3 yards penetrated the gel 1.5" at a final velocity of 767 fps.
#9 at 10 yards penetrated the gel 1.5" at a final velocity of 863 fps.

At 29.3 yards, #9 penetrated .88" with a final velocity of 610 fps.
In all three calculations, the non lead shot ejecta was the same. Gil