Buy Accurate 1680 powder. Want an extremely fast burning, double-base, spherical rifle powder well suited for large capacity, high performance handgun cartridges like the 454 Casull, 460 S&W, and 500 S&W? Accurate Powders brings us the Accurate 1680 smokeless powder. Accurate uses the best ballistic technicians and the highest quality components together to assure that every gun is better served with all of their powders. Accurate 1680 is also an excellent choice for the 22 Hornet and 7.62 x 39, as well as many other low capacity rifle cartridges.