Weatherby Select Plus 300 Wthby Mag 180 Gr Barnes Tipped TSX Lead. The 300 Weatherby Magnum had the flattest trajectory longest range and the greatest killing power of any 300 magnum on the market until the 30-378 Weatherby Magnum came along. Based on the 300 H&H Magnum the 300 Weatherby delivers 300 more fps than its British cousin. Introduced in 1944 this is the all-around cartridge for the big game hunter. Specifications for Weatherby B300180TTSX Select Plus 300 Wthby Mag 180 Gr Barnes Tipped TSX Lead F: Manufacturer: Weatherby Caliber: .300 Weatherby Magnum Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 180 grain Cartridge Case Material: Brass Muzzle Velocity: 3240 ft/s Application: Medium Game Package Type: Box Primer Style: Centerfire Package Contents: Weatherby B300180TTSX Select Plus 300 Wthby Mag 180 Gr Barnes Tipped TSX Lead F What is Weatherby B300180TTSX Select Plus 300 Wthby Mag 180 Gr Barnes Tipped TSX Lead F good for? The manufacturer thinks that it is good for medium game.Weatherby B300180TTSX Select Plus 300 Wthby Mag 180 Gr Barnes Tipped TSX Lead