OK this is what i came up with this weekend.
West coast shot 40 pellets weight 43.5,42.4gr's
Spartan shot 40 pellets weight 39.0gr's 37 gr's
Then i filled a very small container of west coast for a weight of 310gr's and 300gr's
Spartan with same container was 329gr's and 314.5gr's.
ok now i miked pellets west coast 0.089,0.091,0.089,0.095,0.0935,0.090.
for an average of 0.0913. (0.09 is 8 shot).
Spartan was 0.086,0.089,0.0865,0.0855,0.087,0.086,0.0875,0.088,0.088,0.088,0.087 for an average of 0.0871.
i did not due crush test but feel that spartan shot is softer and the run small where as the west coat shot ran on the big side. to me the spartan shot is 8 1/4 shot?