What is a 300 win mag?
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Works at the International Seabed Authority, Lives in Kingston, Jamaica.
Source(s): Accurate Powders load guide v3.5 Hodgdon powders achieve approx 100fps less. The .300 Winchester Magnum (also known as .300 Win Mag or 300WM) (7.62--67mm) is a belted, bottlenecked magnum rifle cartridge that was introduced by Winchester Repeating Arms Company in 1963.
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Source(s): Accurate Powders load guide v3.5 Hodgdon powders achieve approx 100fps less. The .300 Winchester Magnum (also known as .300 Win Mag or 300WM) (7.62--67mm) is a belted, bottlenecked magnum rifle cartridge that was introduced by Winchester Repeating Arms Company in 1963.