Browning X-Bolt Long Action 300 RUM 3rd Rotary Magazine - Black Polymer

The Browning X-Bolt Long Action 300 RUM 3rd rotary magazine is a purpose-built feeding system for magnum rifle hunters who demand reliability where it counts—at the moment of the shot. If you own a Browning X-Bolt chambered in .300 RUM or another long-action magnum caliber, this detachable rotary magazine replaces wear, feeding hiccups, and the limitations of traditional leaf-spring designs with straight-line cartridge delivery engineered to feed every shot cleanly into the chamber.

What sets this magazine apart is its inline rotary mechanism. Rather than forcing rounds to angle sideways into the chamber as older offset-feed designs do, the Browning rotary magazine positions cartridges directly in line with the bolt, eliminating the geometry that causes jams and double-feeds in heavy magnum loads. The polymer construction keeps weight down without sacrificing durability—crucial when you're hiking backcountry glassing ridges or setting up for a long-range hunt. The ergonomic magazine-mounted release means you can drop an empty and seat a fresh mag without breaking your shooting position or fumbling for a side catch.

Holding three cartridges for your .300 RUM, this magazine gives you quick access to firepower for follow-up shots or a swap-out reload in the field. The design is protected by U.S. patents, reflecting Browning's engineering focus on feeding reliability in demanding conditions. If your X-Bolt has seen heavy use or you simply want a backup magazine system you trust, this is the factory-engineered solution.

Key Features

• Inline rotary design feeds cartridges straight into the chamber—no offset angles, no binding
• Lightweight, durable black polymer construction
• Ergonomic magazine-mounted release for fast changes in the field
• Holds three rounds for .300 RUM and other long-action magnum cartridges
• Factory Browning part engineered for X-Bolt platform compatibility
• Patented rotary mechanism (U.S. Patents 8156675, 8484875, 8745912)

Specifications

Frequently Asked Questions

Will this magazine fit my Browning X-Bolt rifle?

This magazine is engineered for Browning X-Bolt long-action rifles. Compatibility is specific to the X-Bolt platform and long-action magnum calibers like .300 RUM. Verify your rifle's model and action length before ordering.

How many rounds does this magazine hold?

This rotary magazine holds 3 cartridges, sized for magnum calibers like .300 RUM. Standard caliber versions of the Browning rotary magazine hold 4 rounds, but this one is optimized for the larger magnum case capacity.

What's the advantage of a rotary magazine over a traditional box magazine?

The rotary design feeds cartridges in a straight line directly aligned with the bolt, rather than offsetting rounds sideways as older leaf-spring magazines do. This inline geometry reduces feeding resistance, double-feeds, and jams—especially critical when hunting with high-recoil magnum loads in unpredictable field conditions.

Is this a factory Browning part?

Yes, this is an OEM Browning magazine designed and manufactured for X-Bolt rifles. It uses Browning's patented rotary feeding system.