The Smith & Wesson Model 648 is a single/double-action revolver chambered in .22 WMR with an 8-round cylinder and a 6-inch barrel. The all-stainless construction and 46.2 oz weight give it a planted feel that works in its favor for target shooting. 
 

Key Specifications 

• Brand: Smith & Wesson 
• Model: 648 
• Caliber: .22 WMR 
• Action Type: Single/Double Action (SA/DA) 
• Capacity: 8 Rounds 
• Barrel Length: 6 inches 
• Overall Length: 11.125 inches 
• Weight: 46.2 ounces (4.3 lbs) 
• Sights: Patridge Front / Adjustable Rear 
• Finish: Stainless Steel 
   

Features 

• Adjustable Rear Sight with Patridge Front: Precise aiming for target practice and small game work. 
   
• Stainless Steel Frame: Corrosion-resistant construction for varied environmental conditions. 
   
• Synthetic Grip: Standard fit designed for comfortable control during firing. 
   
• Double-Action Mechanism: Allows rapid successive shots without manually cocking the hammer. 
   

Use Cases 

 
The 648's 6-inch barrel and adjustable sights make it a natural fit for target shooting at the range -- the sight radius helps and the weight keeps muzzle movement minimal. Small game hunters get 8 rounds of .22 WMR in a reliable revolver platform. The caliber's controllable recoil also makes it workable for newer shooters developing fundamentals.

The S&W 648 draws consistently positive reviews, with accuracy and the 8-round capacity mentioned most often as standout features.

Accuracy gets the most attention from reviewers -- the 6-inch barrel and adjustable rear sight give it a meaningful edge over shorter-barreled revolvers for target work and small game. Build quality earns steady praise; the stainless construction is seen as durable and well-finished. The 8-round cylinder is frequently called out as an advantage over other .22 revolvers that top out at 6 or 7 rounds. Recoil with .22 WMR is described as very manageable, making the revolver accessible to a wide range of shooters.

Versatility comes up often -- owners use it for plinking, pest control, and small game, and most find it handles each application well. The design draws positive remarks from those who appreciate S&W's fit and finish.

The main points of friction are ammunition availability -- .22 WMR can be harder to find and more expensive than .22 LR -- and price, which sits above comparable .22 options. A segment of buyers debate whether the premium over a standard .22 LR revolver is worth it for the WMR chambering.