Introduction and Objective: Bow stability before release is a key determinant of precision, yet its relationship with upper-limb strength in junior elite archers remains under-characterized. This study aimed to quantify triaxial bow oscillation and examine its association with shooting performance and maximal isometric handgrip strength. Methodology: Using an 8-camera Vicon system, 3D kinematics were recorded to evaluate bow displacement and pulling-hand variability during a standardized pre-release window in recurve archers. Results: Longitudinal oscillation was identified as the most consistent kinematic determinant of performance, showing a large negative association with shooting score. A nearly perfect negative correlation was found between mean score and grouping area (minimum enclosing circle method). While handgrip strength was not associated with performance, bow draw force showed a moderate-to-large positive association with score, though it did not reach statistical significance after correction. Conclusions: These findings highlight the critical role of longitudinal stability over raw hand strength in determining shooting precision among elite junior recurve archers.