This can be "the" magnum pistol powder from the IMR lineup. If it states magnum, IMR 4227 would be the choice for real magnum velocities and functionality. In rifle, this powder delivers outstanding velocity and precision in this kind of cartridges because the 22 Hornet and 221 Fireball. Grain form https://imr-4955-powder39505.blgwiki.com/2035859/fascination_about_4955_powder