300 Winchester Magnum (also known as .300 Win Mag or 300WM) (7.62×67mm) is a popular, belted, bottlenecked magnum rifle cartridge that was introduced by Winchester Repeating Arms Company in 1963 as a member of the family of Winchester Magnum cartridges. The .300 Winchester Magnum is a magnum cartridge designed to fit in a standard length action. Dec 18, 2018 · While we tested six loads at 200 yards let me give you the data for three of them. Load #1: Handload consisting of Nosler virgin brass, CCI benchrest primers, 79.0 grains of Varget, Sierra 175 grain MoS Matchking bullet at 2926 feet per second average velocity.
Win A FDE Barrett M107A1 .50 BMG Rifle w/ EOTech Vudu Scope ($15000 Value!) Click Here To Enter. I'm looking for a good load for my .300 RUM. Maybe a load with IMR 7828, Hodgdon H1000,Or Accurate4350.These are some slow burners I have already. The .300 has a 26" barrel with a 1 in 10 twist. I'm thinking 180 grain Nosler ballistic or Sierra hpbt. Thanks in advance for any help. Jeff
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