According to shot charts US "Chilled Shot" sizes run about; #7 = 350/oz #8 = 410/oz & #9 = 585/oz. This would make their per pellet weights respectively 1.25gr, .94gr & .75gr
While these do run light they are not down by a full shot size. You thus still have heavier pellets than if you were shooting US #'s 8 & 9.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra