Precision reloaders using RCBS gold medal match series dies can now fine-tune bullet tension thanks to these self-centering, interchangeable neck bushings. This level of customization decreases brass fatigue and boosts accuracy. For optimal results, high-quality brass with consistent neck wall thickness is essential. Ideal bushing size can be calculated by subtracting 0.002 - 0.003 inches from a loaded round's neck diameter or by doubling the neck wall thickness, adding the bullet diameter and subtracting 0.001 inches. RCBS also recommends reloaders keep bushings slightly above and below the target for flexibility.

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