There are just too many unknowns and maybes...
So to improve accuracy you try to reduce, eleminate or mitigate as many unknowns as possible, despite not clearly knowing if they have a real impact, and how large said impact might be.
The effects of those strategies are also diminishing. Obviously its way easier to half a group size from 2 moa to 1 moa than from 0.5 moa to 0.25 moa.
Thats why some people will weigh their primers, to select the most consistent ones, to give one example.
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