Hornady Unprimed Brass Rifle Cartridge Cases in 300 Remington Ultra Magnum, 20 count, (brand part no. 86724) are manufactured by Hornady in small lots that meet strict quality standards, giving reloaders excellent uniformity in wall thickness, weight, and internal capacity. Hornady measures for tight wall concentricity and runs every case through a pressure calibration test to confirm uniform expansion when fired, which supports proper bullet seating in both the case and the chamber. That consistency translates directly into consistent charges and pressures for 300 RUM handloaders working up a magnum load.

Key Specifications

• Small-lot manufacturing is held to strict quality standards.
• Uniform wall thickness, weight, and internal capacity support consistent charges.
• Tight wall concentricity is measured on every case.
• Pressure-calibration tested for uniform case expansion when fired.
• 300 RUM caliber means these cases are sized specifically for this cartridge.
• 20-count box gives you a batch sized for load development.

Frequently Asked Questions

How does Hornady ensure case uniformity? Cases are measured for tight wall concentricity and pressure-calibration tested for uniform expansion when fired.

Why does that consistency matter for a magnum cartridge? It supports proper bullet seating and delivers consistent charges and pressures, which matters more as cartridge pressure increases.

What caliber and quantity does this box contain? 300 Remington Ultra Magnum, 20 cases per box.

Buy the Hornady Unprimed Brass Rifle Cartridge Cases, 300 RUM, 20ct

Build consistent 300 RUM magnum loads on pressure-tested Hornady brass. Order it from our Lubbock, Texas gun shop for fast shipping, and shop the rest of our reloading brass.