Velocity is important in a versatile varmint cartridge, but extreme speed isn’t everything! Few factory loads break 4000 fps, mostly with lighter bullets. Left to right, these are most of the modern 4000 fps merchants: .17 Remington (25 gr.); 204 Ruger (34 gr.); .22-250 (40 gr.); .223 WSSM (40 gr.); 220 Swift (40 gr.); .243 Winchester (55 gr.).