Mike something seems wrong to me. With Bismuth there is a some inconsistency with the size of the pellets which complicates this. Bismuth is about 87-88% the mass of lead, in theory you would need about 12% greater volume from a lead measure to get the same weight of bismuth. Years ago I filed out a MEC 1 3/8 lead bar a little bit to get 1 1/4 ounce of Bismuth 4 to drop.
An accurate 1 1/2 ounce lead measure should be fairly close to 1 3/8 ounce of Bismuth (slightly on the low side).
Trust the scale before the measure, 602 grains is 1 3/8 ounce.
By volume I don't think you can get 2 oz of lead shot into a 2 7/8" 10ga but I do know you can get 1 3/8 ounce of Bismuth into it.
From the bottle of Bismuth #1 that I have it takes about 102 pellets to make 1 1/4 ounce and 112 pellets to make 1 3/8 ounce if that helps.
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