I had seen those. They do not have the flat base with the square edge of the bullet I posted the picture of. I think the bigger the radius from base to side of the bullet the worse the accuracy is.
I see Hawkesbury bullets (the manufacturer of the bullets Deltamike stock) have in the description of their products, double bevel base, bevel base and flat base. The bullets from them I have tried have all been "bevel base", but the more accurate ones definitely had less of a bevel.
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