Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Nosler Custom 7mm Remington Ultra Magnum ammo pairs the proven 160-grain Nosler Partition bullet with hand-loaded precision engineering. 7mm Remington Ultra Magnum (7mm RUM) is a magnum rifle cartridge designed for flat-shooting, hard-hitting performance at extended range on elk, moose, and large plains game. Each round is hand-assembled by Nosler ballisticians using SAAMI-spec brass—chamfered, deburred, and flash-hole checked—then loaded with hand-thrown powder charges and inspected bullets seated in exact alignment. You’re buying ammunition that matches the consistency of your best handloads, packaged in 20-round boxes with ballistic data printed on the label.
Load Profile
The Nosler Partition bullet has defined controlled-expansion hunting performance for over 60 years. Its fully tapered jacket ruptures instantly at the thin jacket mouth, while the gradual thickening along the shank controls expansion and curls the jacket uniformly outward regardless of impact velocity. The integral partition wall supports the expanded mushroom and retains the rear lead alloy core, ensuring deep penetration and high weight retention on heavy game. At 3225 fps muzzle velocity and 3695 ft-lbs of energy, this 160-grain load delivers flat trajectory and bone-breaking terminal performance out to 400 yards and beyond.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 7mm Remington Ultra Magnum |
| Bullet weight | 160 grains |
| Bullet type | Nosler Partition Jacketed Soft Point |
| Muzzle velocity | 3225 fps |
| Muzzle energy | 3695 ft-lbs |
| G1 ballistic coefficient | 0.475 |
| Sectional density | 0.283 |
| Rounds/box | 20 |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Intended use | Hunting |
| Manufacturer | Nosler |
Nosler Custom ammunition is built for hunters who demand handload-level accuracy and terminal performance without the time investment of reloading. This 7mm RUM load sits at the top of the magnum hunting class—ideal for western hunts where first-round hits at distance matter.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Always follow the four rules of firearm safety when handling loaded ammunition or firearms.
- Verify current state and local laws regarding ammunition purchase and possession in your jurisdiction before ordering.
- This ammunition contains lead. Washing hands after handling and adequate ventilation during use reduce exposure. California Proposition 65 warning applies.
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