It was an unknown spherical rifle propellant when the late Bruce Hodgdon first used H380TM. The powder H380 was correctly named when a charge of 38.0 grains behind a 52-grain bullet generated one hole group of its wildcat of 22 calibers (now called the 22-250). The 220 Swift, 243, 257 Roberts, and other fine-varmint cartridges work well in the H380 as well. The grain shape is a hollow spherical.
When the late Bruce Hodgdon first employed it, it was an unidentified spherical rifle propellant. When a 38.0-grain charge behind a 52-grain bullet produced one-hole groups from his 22-250 wildcat, he properly christened the powder H380. H380 also performs admirably in the 220 Swift, 243, 257 Roberts, and other good varmint cartridges.