The B350 Bushing is a precision tool engineered to work seamlessly with the Hornady Lock-N-Load Headspace Gauge Body (sold separately). Designed for serious reloaders and Australian shooting enthusiasts, it delivers accurate shoulder position measurements for a wide range of rifle cartridges. With a datum diameter of 0.350 inch, this bushing establishes the precise contact point—known as the datum line—used by Hornady to measure case headspace on small to medium rifle cases. Compatible calibres include popular precision and AR-platform rounds such as .22-250 Remington, 6mm BR Remington, 6mm PPC, .250-3000 Savage, .300 AAC Blackout, 6.5 Grendel, and 6mm ARC.

The B350 Bushing’s main function is controlling headspace, allowing reloaders to measure the difference between fired and resized cases to determine exact shoulder bump. This precision adjustment helps maintain consistent chamber fit and reliable bolt closure—essential for dependable performance in hunting or target shooting scenarios.

Proper shoulder bumping—typically between 0.001 and 0.003—offers key benefits: extended brass life by reducing case stretching, improved shooting accuracy through consistent cartridge fit, and enhanced reliability for smooth chambering during field use. Whether fine-tuning loads for your next hunting trip or optimising performance at the range, the Hornady B350 Bushing is an indispensable piece of outdoor equipment for reloaders seeking precision and longevity.

Available now at Xhunter Australia, your trusted source for hunting gear, tactical accessories, and shooting optics to complement your rifle setup.

KEY FEATURES

• Model: B350 Bushing
• Compatibility: Hornady Lock-N-Load Headspace Gauge Body (sold separately)
• Datum Diameter: 0.350 in internal diameter
• Caliber Compatibility: .22-250 Remington, 6mm Bench Rest Remington (6mm BR), 6mm PPC, .250-3000 Savage, .300 AAC Blackout, 6.5 Grendel, 6mm ARC
• Primary Function: Measures shoulder position (headspace) of rifle cartridges
• Headspace Control Range: 0.001–0.003 in shoulder bump
• Material: Precision machined metal bushing
• Application: Used to compare fired and resized cases for shoulder setback measurement
• Benefit: Extends brass life by minimizing case stretching
• Accuracy Improvement: Provides consistent chamber fit for reliable ignition