Accurate 4100 is a double-base slow burning spherical powder with exceptional metering characteristics. 4100 is an excellent choice for high performance full power loads in magnum handgun cartridges. It is ideally suited for the 357 Mag 41 Mag 44 Mag 454 Casull 460 S&W and the 500 S&W. Made in Belgium. Bulk Density(grams/cc) +/-3.2% 0.950 VMD(cc/grams) 1.053 Bulk Density(grains/cc) +/-3.2% 14.661 VMD(cc/grains) 0.068