Magnum Sidewinder 2-Round Holder – Fits .300, .338, .375 & .458 Magnum

The KMRNL Magnum Sidewinder is a two-round cartridge holder designed for magnum cartridges. It holds two rounds at a 7-degree angle toward the operator for improved access and features full-side coverage with adjustable tension control.

Key Benefits

• 7-degree angled orientation — Cartridges are angled toward the shooter for more natural removal.
• Full-side coverage — Protects the ammunition from impacts while keeping rounds secure.
• Adjustable tension — Top bracket secured with two M4 screws allows fine-tuning of retention force.
• Two-round capacity — Carries two magnum cartridges in a compact, organized position.
• Multi-caliber magnum fit — Designed around common magnum case diameters.

Cartridge Compatibility

Optimized for magnum cartridges. Compatible with:

• .300 PRC
• .300 Winchester Magnum
• .338 Winchester Magnum
• .375 H&H Magnum
• .300 Weatherby Magnum
• .300 Remington Ultra Magnum
• .30-378 Weatherby Magnum
• .338 Lapua Magnum
• .458 Winchester Magnum
• .460 Weatherby Magnum

May also fit other cartridges with similar case diameters. Cartridge dimensions and coatings vary by manufacturer. Confirm fit with your preferred ammunition before field use.

Best For

Hunters and precision-rifle shooters who need two secure magnum cartridges with improved access and protection.

Included

• One KMRNL Magnum Sidewinder Two-Round Holder
• Adjustable top bracket with M4 screws

Ammunition, firearm, and other accessories are not included.

Add a secure, angled two-round magnum cartridge holder to your rifle setup.