It is a new IMR family of powders with comparable burn speeds to competitor powders. This new IMR family uses modern technology to ensure the product is “green,” burns clean, and, in most cases, results in more energy from each grain of powder. IMR powders are consistent in bulk density from lot to lot, eliminating some of the variability inherent in other competitors.
With the slowest burn speed of the new IMR family, IMR Blue is an actual magnum propellant, yielding outstanding performance in 12-gauge shotshells. Superior burn speed for “back fence games” involving 1-14- and 1-3/8-oz.Loads are the norm. Data for 10-gauge, 16-gauge, and 20-gauge are also available, providing accurate magnum velocities and performance.
For shotshell usage, powder densities are similar to competitor data. Most shotshell data is identical, but IMR recommends visiting www.IMRReloading.com for the correct, up-to-date data and bushing charts. For pistol usage, pistol data is materially different from competitor data, with lower charge weights and higher velocities at maximum pressures. IMR recommends always consulting www.hodgdonpowdercompany.com for the correct, up-to-date data.