The Ruger No. 1 Light Sporter is a falling-block single-shot rifle chambered in .275 Rigby (7x57mm Mauser). The 24-inch barrel and 7.5 lb weight put it in comfortable territory for a day in the field, and the walnut stock with satin blued finish gives it a classic look that's held up since the No. 1 was introduced decades ago. 
 

Key Specifications 

• Model: Ruger No. 1 Light Sporter 
• Caliber: .275 Rigby (7x57mm Mauser) 
• Action: Single Shot 
• Barrel Length: 24 inches 
• Capacity: 1 Round 
• Weight: 7.5 lbs. 
• Finish: Walnut/Black 
   

Detailed Features 

The falling-block action is mechanically simple, strong, and locks up tightly. It handles the 7x57mm cartridge with plenty of margin. The 24-inch barrel gives the 7x57mm room to develop velocity, which matters for that caliber's mild powder charges. 
 
Express sights come standard. The single-shot format naturally encourages deliberate shot placement, which is part of the appeal for hunters who prefer working precisely over working fast. 
 

Usage 

The .275 Rigby has a long track record on medium to large African game and works equally well on North American deer and elk. The single-shot configuration is well-suited to spot-and-stalk hunting and to shooting courses that reward precision over round count. Ammunition availability is more limited than 7mm Rem Mag or .308 Win, which is worth noting for high-volume shooters.

Owners of the Ruger No. 1 Light Sporter in .275 Rigby tend to be enthusiasts who sought out this specific combination deliberately, and their feedback reflects that.

The craftsmanship gets consistent praise. The fit between the walnut stock and the receiver, the quality of the bluing, and the overall feel of the action are regularly mentioned as highlights. The falling-block mechanism in particular earns appreciation from shooters who prefer mechanical simplicity over modern bolt-action complexity.

The .275 Rigby chambering draws comments about cartridge character: it's a mild-recoiling 7mm with a good ballistic profile for medium to large game. That comes up positively in field reports from deer and elk hunters.

The practical criticisms are consistent: .275 Rigby ammunition is harder to source than common calibers, and the single-shot format isn't for everyone. Shooters who want fast follow-up shots or who do a lot of range work will find the format limiting. A few owners also note that the No. 1 can be picky about handloads until you work up the load, not unusual for a single-shot with a tight chamber.