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375 Remington Ultra Magnum

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  • .375 Remington Ultra Mag 300 Grain Nosler AccuBond-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.

    It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .375 caliber with no other changes. Factory loadings are less powerful than handloads for the cartridge. Remington factory loads push a 300 grain bullet at 2760 ft/s producing 5070 ft·lbf of energy.

    During 1999 Remington Arms introduced their .300 Remington Ultra Magnum, an extremely powerful cartridge based loosely on the .404 Jeffery cartridge case design blown out to maximum dimensions. In the same year Remington announced that they intended to introduce both a .338 RUM and 7mm RUM, both arrived on the market in 2000. Following this, Remington made another statement in the year 2000 of their intention to introduce a .375 caliber RUM. The .375 RUM was released in 2001 and is the largest of the Remington Ultra Magnum cartridges.

    The case design of the .375 RUM is the same as its 7mm and .30 caliber counterparts. These three cartridges differ from the .338 RUM in that the .338 has a slightly shorter case for the sake of a comfortable cartridge overall length (COAL) within the limits of the Remington M700 rifle magazine.

    Choice Ammunition has taken our 100% hand-loading techniques and produce an extremely accurate, highly dependable round for the .375 Remington Ultra Mag in this load. Our loading tolerances are only matched by passionate hand-loaders in their own loading rooms. Consistent seating depths, powder charges and proprietary formulas of Choice Ammunition, make this 300 Grain Nosler AccuBond round the best you can buy on the commercial market today.

    The Bullet:

    Through an exclusive bonding process that eliminates voids in the bullet core, AccuBond couples Nosler’s proven copper-alloy jacket with its special lead-alloy core. The result is a bullet that flies true, penetrates deep and retains its weight, without causing extensive barrel fouling. The unique white polymer tip resists deforming and initiates expansion on impact. Nosler’s Solid Base at the rear of the bullet acts as a platform for large diameter mushrooms.

    • Velocity: 2,832 fps
    • 100% Hand Loaded
    Add to cart

    9 in stock (can be backordered)

  • .375 Remington Ultra Mag 260 Grain Nosler AccuBond-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.

    It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .375 caliber with no other changes. Factory loadings are less powerful than handloads for the cartridge. Remington factory loads push a 300 grain bullet at 2760 ft/s producing 5070 ft·lbf of energy.

    During 1999 Remington Arms introduced their .300 Remington Ultra Magnum, an extremely powerful cartridge based loosely on the .404 Jeffery cartridge case design blown out to maximum dimensions. In the same year Remington announced that they intended to introduce both a .338 RUM and 7mm RUM, both arrived on the market in 2000. Following this, Remington made another statement in the year 2000 of their intention to introduce a .375 caliber RUM. The .375 RUM was released in 2001 and is the largest of the Remington Ultra Magnum cartridges.

    The case design of the .375 RUM is the same as its 7mm and .30 caliber counterparts. These three cartridges differ from the .338 RUM in that the .338 has a slightly shorter case for the sake of a comfortable cartridge overall length (COAL) within the limits of the Remington M700 rifle magazine.

    Choice Ammunition has taken our 100% hand-loading techniques and produce an extremely accurate, highly dependable round for the .375 Remington Ultra Mag in this load. Our loading tolerances are only matched by passionate hand-loaders in their own loading rooms. Consistent seating depths, powder charges and proprietary formulas of Choice Ammunition, make this 260 grain Nosler AccuBond round the best you can buy on the commercial market today.

    The Bullet:

    Through an exclusive bonding process that eliminates voids in the bullet core, AccuBond couples Nosler’s proven copper-alloy jacket with its special lead-alloy core. The result is a bullet that flies true, penetrates deep and retains its weight, without causing extensive barrel fouling. The unique white polymer tip resists deforming and initiates expansion on impact. Nosler’s Solid Base at the rear of the bullet acts as a platform for large diameter mushrooms.

    • Velocity: 2,961 fps
    • 100% Hand Loaded
    Add to cart

    10 in stock (can be backordered)

  • .375 Remington Ultra Mag 300 Grain Nosler Partition-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.

    It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .375 caliber with no other changes. Factory loadings are less powerful than handloads for the cartridge. Remington factory loads push a 300 grain bullet at 2760 ft/s producing 5070 ft·lbf of energy.

    During 1999 Remington Arms introduced their .300 Remington Ultra Magnum, an extremely powerful cartridge based loosely on the .404 Jeffery cartridge case design blown out to maximum dimensions. In the same year Remington announced that they intended to introduce both a .338 RUM and 7mm RUM, both arrived on the market in 2000. Following this, Remington made another statement in the year 2000 of their intention to introduce a .375 caliber RUM. The .375 RUM was released in 2001 and is the largest of the Remington Ultra Magnum cartridges.

    The case design of the .375 RUM is the same as its 7mm and .30 caliber counterparts. These three cartridges differ from the .338 RUM in that the .338 has a slightly shorter case for the sake of a comfortable cartridge overall length (COAL) within the limits of the Remington M700 rifle magazine.

    Choice Ammunition has taken our 100% hand-loading techniques and produce an extremely accurate, highly dependable round for the .375 Remington Ultra Magnum in this load. Our loading tolerances are only matched by passionate hand-loaders in their own loading rooms. Consistent seating depths, powder charges and proprietary formulas of Choice Ammunition, make this 300 Grain Nosler Partition round the best you can buy on the commercial market today.

    The Bullet:

    Partition Bullets feature a fully tapered jacket that ruptures instantly at the thin jacket mouth, yet the gradual thickening along the bullet’s axis controls expansion and curls the jacket uniformly outward at high or low velocities. Nosler’s integral Partition supports the expanded mushroom and retains the rear lead alloy core. The enclosed rear core retains more than half the original bullet weight for deep penetration. The special crimp locks in the rear core section, adding strength to resist deformation under the pressure of heavy magnums.This makes this round no match for Deer, Sheep, Pronghorn and Black Bear and other medium-sized game.

    • Velocity 2,786 fps
    • 100% Hand Loaded
    Add to cart

    10 in stock (can be backordered)


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Thank you for visiting Choice Ammunition!Home of Premium Ammunition- 100% Hand-Loaded in Western Montana.

As you may know, the ammunition and firearms industry is experiencing unprecedented times beginning with COVID 19 coming from China in early 2020. Some talked of defunding police departments about the same time, even as riots and lawlessness raged on in our cities with unrest. We then saw a very contentious presidential campaign and ultimately- an inauguration of what could be a very unfriendly 2nd Amendment administration controlling both houses of Congress. For these reasons and more, we see demand at all time highs in the industry, in addition to mass shortages of components. I personally do not see things changing any time soon either...

With this, we are doing everything possible to hand-load and get products shipped in a timely manner, but we cannot simply turn machines up like others! Any back-orders on this website that we allow, we feel will ship in a reasonable period of time and we are averaging about 2-3 weeks presently. However, we are reliant on our suppliers to deliver components to us also, and that can unexpectedly be delayed on occasion. When this happens, it is possible to see 30-60 days, and sometimes more- to get ammunition sent out to you. Please know, all backorders will be filled at the price you purchased the ammunition for. If you find something elsewhere- we are happy to cancel any order.

We try to answer all office calls and prefer calls over emails or social media. We ask you to please refrain from calling or changing your order unless it is absolutely necessary- keeping in mind the time-frames I mentioned above. Every call we answer removes the focus on sourcing components and loading/shipping your ammunition!  We promise to get your order out as soon as we possibly can- yet, ask that you please understand this crazy market we are all in- if indeed you are delayed!

We do not believe in price gouging or increasing margins in a market such as this- and we will do everything possible to remain competitive with “factory” ammo, while providing our premium hand-loaded ammunition to the market. It does appear that prices may increase this year however, as there is much volatility in pricing for our brass, bullets, powder and primers.

Thank you for considering Choice Ammunition if you are a new customer- and thank you for another order if you are returning. We truly appreciate all of you and have built our business from going the extra mile with our products and for our customers!

Jon Wemple

President/CEO