I will admit, when someone brings a 22 semi-auto in for malfunctioning, I use the Remington Thunderbolt to make sure the firearm has a chance of functioning with the other popular brands.Well, I hate to break it to you guys but Remington Thunderbolt ammo is made by the same guys/company that makes Federal and CCI. All of these companies are owned and controlled by Jason Vanderbrink CEO at Vista Outdoors. In regards to the projectiles, all 22 rimfire bullets are made of pure lead, as soft as it gets. I am sure there is some hardness on the surface imparted by the swaging process but not much due to the nature of lead. Some of the better bullets have mechanical coating of copper or brass which raises the hardness a little. I have never encountered a plated standard velocity 22 LR. Some of the most accurate SV Target has the gooies