Ammo Brief: The Niche .375 Renner

A single-shot rifle specialist, the .375 Renner is not widely known, but is more than effective on a wide range of game.

What Makes The .375 Renner Unique:

• Designed specifically for single-shot rifles
• Fills a perceived performance gap between the .375 Winchester and the .375 H&H Magnum cartridges
• .45-90 Winchester is the Renner's parent case

The .375 Renner was designed specifically for single-shot rifles to fill a perceived performance gap between the .375 Winchester and the .375 H&H Magnum cartridges. Roger Renner, long-time custom gunmaker and writer, was inspired by the larger .375 H&H Magnum. Based on the full-length .45-90 Winchester case necked down to .375, this rimmed case offers easy loading and extraction while providing capacity to hold 60 grains of IMR powder under the bullet. Renner chose a generous taper for the case body with a gentle shoulder angle.

General Comments

The .375 Renner will easily handle all .375 bullet weights, driving them at velocities from 2,100 to 2,400 fps. It can be safely loaded to span the performance spectrum from the .38-55 Winchester on the low end and nip the heels of the .375 H&H on the high end. The objective was not to create another magnum; rather it was to launch big-game bullets at moderate, yet effective, velocities. The .375 Renner also handles cast bullets very well and shows great potential as a long-range blackpowder cartridge. RJ Renner (RJRenner.com) builds custom Ruger No. 1 English Stalking Rifles in .375 Renner, delivered with loading dies and brass. Reed’s Ammunition offers loaded ammunition.

On-Target Ammunition Information:

• The Blistering Hot 30 Nosler
• The .280 Ackley Improved
• If You Had To Pick Just One Cartridge, What Would It Be?
• Loading the .308 Winchester

Editor's Note: This article is an excerpt from Cartridges of the World, 16th Edition.