Typically it was always suggested to find your PAP with a low flare ball such as a plastic ball. Because Your pap can vary some (not a lot though) depending on how dynamic the core is.
Today it's usually suggested to find your PAP with a ball that's like what your normally using (or going to replace) the most. So If you generally start out with a resin ball, then use it. If you have several resin balls then find your PAP on 2 or 3 of them and average them.
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