You need to know the total number of pellets in the shotgun shell. Then divide the # of pellets in the 30" circle by the total # of pellets in the shell to get a percentage. 25%=IC 50%=MOD 75%=FULL
Average # pellets in 7 1/2 shot:
1 1/4oz= 437
1 1/8oz= 394
1 oz= 350
7/8 oz= 306
3/4 oz= 262
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