Remington Subsonic .22 Long Rifle 40 Grain Hollow Point Brass Cased Rimfire Ammo 225 Rounds. Its tack-driving rimfire performance was developed through a joint effort of Remington and AAC team experts manufactured with tight velocity control to eliminate supersonic cracks. Driving a copper-plated hollow- point bullet optimized for reduced lead buildup in silencer ports and maximum effectiveness at lower velocity. Specifications for Remington Subsonic .22 Long Rifle 40 Grain Hollow Point Brass Cased Rimfire Ammunition: Manufacturer: Remington Caliber: .22 Long Rifle Number of Rounds: 225 Bullet Type: Hollow Point (HP) Bullet Weight: 40 grain Cartridge Case Material: Brass Muzzle Velocity: 1050 ft/s Application: Hunting Package Type: Box Primer Style: Rimfire Package Contents: Remington Subsonic .22 Long Rifle 40 Grain Hollow Point Brass Cased Rimfire Ammunition What is Remington Subsonic .22 Long Rifle 40 Grain Hollow Point Brass Cased Rimfire Ammunition good for? The manufacturer suggests that it is good for hunting.Remington 21249: Subsonic .22 Long Rifle 40 Grain Hollow Point Brass Cased Rimfire Ammo 225 Rounds