Track a charge ladder — velocities, spread and group size per step — to find your rifle's node.
This tracks results, it doesn't set charges for you. Take your low/high charge weights from a
current manufacturer manual (Hodgdon, Hornady, Sierra, etc.), start at or below the published minimum,
and increase in small steps. Stop immediately at any pressure sign — flattened or cratered primers,
a sticky or hard-to-lift bolt, case head expansion, or an unexplained velocity jump.
