Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (2023)

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (1)

America hasn't fully embraced the metric system, but our shooters and hunters have. We are now familiar with 6mm, 6.5mm, 7.62mm, and especially 7mm. At least 14 7mm cartridges are now made in the US, with several Wildcats waiting in the wings.

One might think that Remington started the 7mm cartridge trend in 1962 with its famous 7mm Remington Magnum, but by then the 7mm Mauser was already well known. In 1898, under fire from the Spanish Mausers, it impressed our troops in Cuba with its power. Teddy Roosevelt was so impressed that he used the 7×57 as the basis for what would later become the .30-06 Springfield.

Meanwhile, in Africa, a commercial Scottish ivory hunter named Bell made the small 7x57mm famous as a big game cartridge, taking some 800 elephants with him. His bolt-action rifle was chambered for the confusing .275 Rigby. That was the 7x57mm, redesigned for the non-metric British Rigby rifle.

Less well known in the US (but ballistically more advanced) was the 7mm Weatherby Magnum of the early 1940s. More obscure were the Gibbs 7mm and the Norma-loaded Sharpe & Hart 7x61mm of the early from the 1950s. Neither of them realized it, but American shooters were certainly beginning to see the potential of 7mm cartridges. Then Remington threw the doors wide open with their new 7mm Magnum in their equally new and affordable M700 rifles. Almost overnight, "Seven em em" was on the lips of American hunters. And in the chambers of their weapons.

The 7mm shoots .284" diameter bullets through .28" diameter bores, but only two use this imperial measurement system in their titles: .280 Remington and .284 Winchester, both excellent but underrated "standard" rifles. ". Like all 7mm, they can shoot bullets as light as 100 grains and as heavy as 180 grains. Handloaders can take advantage of all of these advantages, but most commercial ammunition contains 120 to 178 grain bullets.

(Video) The 30 Caliber Magnum Showdown: Which is the best 30 Caliber Magnum?

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (2)

The 7mm advantage comes from relatively high BC (ballistic coefficient) bullets in popular weights commonly used for hunting horned and antlered game. Typical .284 bullets, ranging from 140 to 175 grains, are wide enough to resist flexing (a problem Bell had with thick, hard elephant bones) but narrow enough to minimize drag. For the same basic shape and muzzle velocity (MV), a 180-grain .284 bullet flies flatter, travels less, and retains more downward energy than a 180-grain .308 bullet. And you'll probably push more because most of your volume is shifted in the long axis behind your nose. The retained mass helps maintain momentum.

Of course, if the BC and MV are the same, you can accurately match the 7mm ballistics to a .308 bullet. The .308 just needs to be a bit heavier. And that means more dust. And more recoil. And that's one of the reasons why the 7mm is so popular. If you're targeting a moose or mule deer with a 180-grain bullet at around 2900 fps, the 7mm version at that bullet weight will shoot flatter, drift less, and put more energy on the target than the 7mm version. .308.

That is the advantage of the 7mm Magnum. Let's compare three cartridges that do this; the old 7mm Rem. Mag., the new .28 Nosler, and the hype 7mm RUM.

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (3)

Magnum Remington de 7 mm

Like most of our early magnums, this one is based on the .375 H&H Magnum belted case. I'm sure the Remington engineers started with the .300 H&H case, but it was itself a modification of the .375, so same difference. Engineers made three modifications that gained popularity: they shortened the shell to fit standard-length stocks. Side panels straightened. They sharpened the angle of the shoulder. The resulting shell contains 77 grains of water with a 175-grain bullet seated the full length of the cartridge (measured from base to bullet tip).

Fill that brass case with smokeless powder instead of water, and according to some handloading guides, a 62.5-grain Reloder 22 should pull a 175-grain bullet out of a 24-inch barrel at 2870 fps. Another claims that 74 grains of Hodgdon 870 will produce 2954 fps. Your results may vary.

Since the 7mm RM is a well-known benchmark, let's lay down some basic performance numbers on an 8-pound, 24-inch barreled rifle that has a representative muzzle, boattail, 175-grain hunting bullet, B.C. .672., VM 2900 fps. This tradeoff must account for the slower muzzle velocities produced by many rifles with factory loads and safe handloads. We use a 10" diameter target zone to calculate the maximum point-blank range. (Target for the center and the bullet will not rise more than 5 inches or fall more than 5 inches inside the MPBR. This is probably too high for the hunts in the real world, but we'll use it here as a standard to compare against Use cartridge to cartridge consistency).

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (4)
  • 7mm RM, 2900 fps from 24in bl. Burning 61 grains of Reloder 22
  • recoil:26.5 foot-pounds at a velocity of 14.6 fps
  • muzzle power:3,269 foot-pounds
  • Maximum pressure:61,000 psi
  • MPBR:365 yards (zero at 307 yards, 3.9 inches high at 100 yards)

Those are impressive numbers. They partly explain the continued popularity of the 7mm Rem. Mag. But to really appreciate this, let's run a trajectory graph in some crazy areas.

First, notice that the kinetic energy stays above the "moose-kill minimum" of 1500 foot-pounds at 700 yards. I don't believe in that minimum, nor in shooting moose at 700 yards, but it's an impressive feat for a standard-length cartridge nearing its 60th birthday. Look at the perpendicular wind deflection from 10 mph at 400 yards: just 7.82 inches. Clearly, the 7mm Rem. Mag. and a senior B.C. bullets have what it takes to hunt anything but dangerous game. Now let's compare this to our other two 7mm contenders.

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (5)

.28 Nosler

Improved 7mm Rem. Mag. Nosler's goal was performance without moving to a full magnum-size cartridge and rifle action. The 2015 .28 Nosler was his solution. It's based on the bold 404 Jeffery strapless case, but Nosler is probably just getting started with the 7mm RUM, which itself is a modded Jeffery. Nosler shortened the body of the RUM, giving it a 35 degree shoulder and shortening the neck to 0.276 inches. The edge of the RUM was already crimped to fit a .534" bolt face.

The finished case holds 90 grains of water with our 175 grain Boattail point bullet inserted. Fill it with 88 grains of slow-burning Reloder 33 powder, and according to Nosler's Guide to Reloading 8, you should get 3211 fps out of a 26-inch barrel. This leads to the following performance:

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (6)
  • 28 Nosler, 3200 fps from 26”bl., 88grs. dealer 33
  • recoil:39,64 ft-lbs a 17,86 fps
  • muzzle power:3,980 pound-feet
  • Maximum pressure:65,000 psi
  • MPBR:398 yards (zero at 337 yards, 3.59 inches high at 100 yards).

Wow grandma! Those are impressive numbers. Over 1,900 foot-pounds of power at 700 yards. Only 5 inches of drop at 400 yards and 6.8 inches of wind deflection. This is a long range dream cartridge for sure. But you pay the price for recoil and that 26-inch barrel. Adding two inches of barrel to the 24 inches of our 7mm Rem. Mag. may not seem like much of a problem until you start maneuvering in and out of boxes, trucks, cases, and lumber. The difference might surprise you. It is worth considering. Now let's look at the 7mm RUM.

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (7)

7 mm Remington Ultra Mágnum

In 2001, Remington turned to the old case .404 Jeffery for its ultra-fast 7mm. But they didn't cut anything. Do you want 98.2 grains of water capacity behind a sitting 175 grain ball? you go long Full magnum long action. The overall cartridge length of the 7mm RUM is 3.6 inches, right there with a .375 H&H Magnum.

Despite all that bulk of powder, all the reloading guides indicate that the 7mm RUM with a 26" barrel is around 3150 fps, slightly slower than the .28 Nosler. Part of this is due to the Remingtons. 0.40" freeborns that are integrated into their 7mm rums to minimize chamber pressure when firing. This frictionless ball bounce allows inertia to break more easily. Switching to a 28" barrel provides more volume to burn those big doses of slow-burning powder and adds 50 to maybe 100 fps at 26" barrel velocities. But if you suspect a 26" barrel might be a bit unwieldy, wait until you're lugging a 28" barrel. This is not a gun you want to weave through dog-hair wood.

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (8)
  • 7 mm RUM 3150 fps from 26” b. 92 gr Return
  • recoil:40,5 ft-lbs a 18 fps
  • muzzle power:3,856 foot-pounds
  • Maximum pressure:65,000 psi
  • MPBR:392 yards (zero at 332 yards, 3.63 inches high at 100 yards).

As you can imagine, there isn't much of a track/performance difference between the RUM and the Nosler.

Enfrentamiento Magnum de 7 mm: Rem. of 7 mm. loader vs. .28 Nosler vs. 7 mm RUM (9)

Our choice

So how do you choose between these three? They all throw the same balls more than hard and fast enough for anything. Yes, the .28 Nosler is winning the ballistics competition with the RUM hot on its heels. But with laser rangefinders he can easily compensate for the 7mm Rem's slightly higher dropout. Mag. And at reasonable hunting distances, even a basic MPBR hunter should have more than 90 percent of their firing range covered by the Rem Mag. without laser support. Additional benefits with the 7mm Rem. Mag. These include more options in rifles and ammunition, more affordable and less expensive ammunition, less recoil, a potentially shorter, more manageable and lighter rifle, and longer barrel life.

Barrel life is always an issue with top velocity, so-called overbore cartridges. The additional heat required to reach hyperdrive eats away at the barrel throats fairly quickly. Some claim only 600 rounds of barrel life for RUM, 1,000 rounds for .28 Nosler, 2,000 for Rem. Mag. Carefully spaced shots (don't overheat the barrel) will always extend the life, as will every shooter's accuracy requirements. A "fired" barrel for target competition might still be accurate enough for big game.

Keep reading:Small calibers for big game. This is nothing new

The barrels are like truck tires. You can go 10 mph and get thousands and thousands more miles off your tires, but wouldn't you rather drive at highway speeds? High velocity cartridges are high velocity for a reason. If you want the performance of 7mm Magnum, you have to change the tires (barrels) from time to time. Most hunters who resist target practice can get a good lifetime of accuracy out of this 7mm.

A bigger problem could be the heating of the barrels and the subsequent "wandering". Thin barrels tend to warp slightly in heat, which opens up clumps. Three Quid-k shots can overheat a thin barrel and turn a 1 MOA rifle into a 2 MOA rifle. If you go for a hot 7mm, go for one with a fairly heavy barrel contour.

Adding that up, I use the 7mm Rem by default. Mag. for my type of hunting. Lots of walking, walking, climbing, shooting at 450 yards, maybe 500 yards. This requires a light rifle. No more than 7 pounds finished and ready to use. It would be ready for all North American game plus game from the African plains up to 1,800 pound Eland. In fact, over the years my 7mm has handled these things. But if I were young and strong and starting from scratch, I might be drawn to the .28 Nosler. The extra range is tempting, but you'd pay the price with a 26" barrel, which is pretty heavy. The short, lightweight barrels just don't do justice to high-temperature, high-velocity, high-pressure, overbore magnums.

If you were looking for the absolute pinnacle of extreme performance and were willing to take a 28" barrel, I'd take a closer look at the RUM.

Top Articles
Latest Posts
Article information

Author: Nicola Considine CPA

Last Updated: 05/11/2023

Views: 6251

Rating: 4.9 / 5 (49 voted)

Reviews: 80% of readers found this page helpful

Author information

Name: Nicola Considine CPA

Birthday: 1993-02-26

Address: 3809 Clinton Inlet, East Aleisha, UT 46318-2392

Phone: +2681424145499

Job: Government Technician

Hobby: Calligraphy, Lego building, Worldbuilding, Shooting, Bird watching, Shopping, Cooking

Introduction: My name is Nicola Considine CPA, I am a determined, witty, powerful, brainy, open, smiling, proud person who loves writing and wants to share my knowledge and understanding with you.