To the mention of air rifles. In the US, way back when, air rifles (like the Benjamin and Sheridan) and BB guns (like the Daisy Red Ryder) were two different things. The pump up air rifles of yesterday, such as the Benjamin which is still made, that were intended for hunting were typically .22cal and were considered good for rabbits and squirrel.
In the 60's and 70's they faded out a bit as .177 rifles for target shooting and just playing around became popular. Because these rifles were the same bore diameter as a steel BB, the two types of pneumatic rifles became sort of one in the eyes of most people.
Americans are getting more serious about their air rifles and there are a number of custom air rifle makers in the US now such as Quackenbush. The Korean imports are very popular. The Quackenbush rifles are typical of custom and higher end production air rifles (such as the Airforce Texan) in the US and they are powerful enough to drop an elk. Americans, when they think of a serious air rifle, are often enamored with the powerful .46cal Girandoni air rifle carried by Lewis and Clark on their famous expedition.
For the lever cocked, piston rifles you can get some powerful ones, such as the Hatsan 125 (made in Turkey). The .22cal Hatsan 125, which pushes a .22cal pellet at 1000fps, is a serious hunting tool. Most air rifles of this type are made in China or Turkey these days. In the 1980's or before, if you wanted a serious air rifle of this type, you bought something like a German Feinwerkbau.
The Survivalist movement was one of the forces that got people serious about air rifles again. The well known survivalist author Mel Tappan, in his classic book, 'Survival Guns', talked about how air rifles were a valuable tool, capable to doing most of what a .22LR could do, but quietly and with much cheaper and more compact ammo.
I like to have the ability to be as self-sufficient as possible, for various reasons. While the very large bore air rifles will use a cast lead bullet, the hollowbase lead pellets used by .177 and .22cal rifles tend to be mass produced on swaging machines. However, I found one guy, the only guy on the planet it seems, a machinist in the UK that is actually making a decent, viable kit to manufacture your own airgun pellets. Basically, you have a mold and you make a small batch of lead pellet cores. Then, one at a time with a small swaging tool, you make your finished pellets.