More things to consider in this thread:
https://www.nzhuntingandshooting.co....ign-why-25207/
As Bagheera mentions, in theory more precise alignment should be possible by creating a sight picture that makes use of fine gaps of a contrasting colour between the reticle and the shape of the target, or alternatively the reticle splits the target into four congruent shapes, again of a colour that contrasts with the black of the reticle.
The problem with a solid black diamond is that the width of the reticle - regardless of how thin - must necessarily obscure the vertices of the diamond. Within that width no further refinement may be possible. Try adding a second method of alignment to this same shape by instead using a black outline of a diamond leaving the centre white instead of solid. The reticle quarters this contrasting centre into 4 triangles. As in your original post the target design can then be reduced down in size - to the minimum usable for the width of reticle at the scopes maximum usable power setting. If a solid diamond is already a contrasting colour then you have the same thing.
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