Wobble Zone
Also: Arc of Movement
The small area the reticle drifts across on the target from the shooter's own movement, breathing, and pulse while holding aim.
The wobble zone is the patch of the target your reticle floats over while you settle into a shot, driven by heartbeat, breathing, and muscle tremor. Even a well-built position cannot freeze the rifle completely, so the goal is to shrink that arc of movement and keep it centered on the aiming point rather than chase a perfectly still picture. Building a solid natural point of aim is the main lever, because a relaxed position lets the rifle hover on target instead of fighting your muscles back toward it.
Good shooters learn to time the trigger break for the moment the wobble is smallest and most centered, applying steady trigger control so the shot leaves cleanly. Keeping a clear sight picture and holding follow through after the break tells you where the reticle actually was at ignition, which is the honest record of how well you managed the zone.