This extruded powder is a member of Hodgdon’s Extreme series of powder with slow-burning characteristics perfect for highly-overbored magnums like the 7mm Remington Magnum 7mm STW and the 30-378 Weatherby. In addition with heavy bullets H1000 gives top velocity and performance in such cartridges as the 6mm-284 257 Weatherby 270 Winchester and 300 Winchester Magnum. In a short period of time this powder has achieved considerable popularity among long-range match shooters.