::.375 Remington Ultra Magnum


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The .375 Remington Ultra Magnum, also known as the .375 RUM is a .375 rifle cartridge introduced by Remington Arms in 2000. The cartridge is intended for large and dangerous game.<ref name=Barnes />

It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .375 caliber with no other changes.<ref name=Barnes /> Factory loadings are less powerful than handloads for the cartridge. Remington factory loads push a 300 grain (19 g) bullet at 2760 ft/s (840 m/s),<ref name=R>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> producing 5070 ft·lbf (6.88 kJ) of energy. A handloader can increase the muzzle velocity of a 220gr bullet to 3321 ft/s (900 m/s),<ref name=HO>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and develop 5800 ft·lbf (7.9 kJ).<ref name="chuck_sub">"The .375 Remington Ultra Mag" by Chuck Hawks</ref>

.375 Remington Ultra Magnum sections
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