The first Winchester pump .22 rifle was the Model 1890. It was made to shoot either .22 Short , .22 LR , or .22 WRF. .22 Shorts would not feed through an 1890 designed for .22 LR, and vice versa. I had a friend who owned a Model 1890 in .22 LR, and we managed to convert it so that .22 Short cartridges would function in it by putting a short wooden plug in the cartridge carrier (.22 Shorts were all we could afford). The next Winchester .22 pump to come along was the Model 1906, and it would handle short, long, and long rifle ammunition interchangeably, as would the later Winchester pump .22s. My all-time favorite .22 rifle was the Remington Model 550 semiautomatic which would also handle S, L, and LR cartridges interchangeably.