Ramshot Magnum Smokeless Rifle Powder (8 Lbs), the muzzle velocities achieved in the magnum class of cartridges are some of the highest in the industry. Ramshot Magnum Smokeless Rifle Powder (8 Lbs) 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.