The muzzle velocities achieved in the magnum class of cartridges are some of the highest in the industry. Ramshot Magnum's powder excellent velocities coupled with its cleanliness make it a great choice for high volume match shooters. Ramshot Big Boy powder was renamed Ramshot Magnum in 2001. Big Boy and Magnum are the exact same powder - just a new name. Data using Ramshot Big Boy is applicable for Ramshot Magnum. Grain shape is flat ball. Ideal Calibers: .25-06, .270 WSM, 7mm Rem Mag, .300 WBY, .300 Win Mag, 300 RUM.