Remington Premier Ammunition 300 Remington Ultra Magnum 180 Grain Swift Scirocco II Box of 20
The Remington Premier Scirocco Bonded line is some of the most versatile and reliable big-game ammunition offered today. The expansion-generating polymer tip and boat tail base combine to defy air resistance at the front end, and reduce drag at the back.
The progressively thickening, heavy-based, pure copper jacket is bonded to the lead core to preserve bullet integrity and retain over 75% of its weight at all velocities. Finally, the bullet’s precise concentricity and secant ogive nose profile produce accuracy you would be proud of in match competition. This ammunition is new production, non-corrosive, in boxer-primed, reloadable brass cases.
.300 Remington Ultra Magnum, also known as the .300 Ultra Mag, 7.62×72mm or .300 RUM is a 7.62 mm (.308 inch) rifle cartridge introduced by Remington Arms in 1999. 300 Remington Ultra Magnum
The .300 Remington Ultra Magnum is one of the largest commercially available .30 caliber magnums currently being produced. It is a beltless, rebated rim cartridge, capable of handling all large North American game, as well as long-range shooting. 300 Remington Ultra Magnum
Among commercially produced .30-caliber rifle chamberings, the .300 Remington Ultra Magnum is second only to the .30-378 Weatherby Magnum in cartridge-case capacity.
In the early 1980s Aubrey White and Noburo Uno of North American Shooting Systems (NASS) based in British Columbia Canada began experimenting with the full length .404 Jeffery by reducing the taper and necking it down to various calibers such as 7 mm, .308, 311, 338, 9.3 mm and .375.
These cartridges were known variously as the Canadian Magnum or the Imperial Magnums. Rifles were built on Remington Model 700 Long Actions and used McMillan stocks. Cartridges were fire formed from .404 Jeffery cases with the rim turned down, taper reduced and featured sharp shoulders.
Both Remington and Dakota Arms purchased the formed brass designed by Noburo Uno for use in their own experimentation and cartridge development.
In 1999 Remington released the first of a series of cartridges virtually identical to the Canadian Magnum cartridges which featured a slightly wider body, increased taper, and shallower shoulders and named it the .300 Remington Ultra Magnum.
Dakota too released their own version of the cartridge but chose not to turn down the rim and shortened the case to work in a standard length action. 300 Remington Ultra Magnum
Remington would go on to design their own shortened versions of the Ultra Magnum cartridge which they were to call the Remington Short Action Ultra Magnum or RSAUM for short.
DESIGN & SPECIFICATION
.300 Remington Ultra Magnum is a member of the Remington Ultra Magnum cartridge family based on the .404 Jeffery via the Canadian Magnum cartridges.
As these cartridges feature wider bodies than the belted magnums based on the .375 H&H case, these cartridges have greater case capacities than their corresponding full length belted Magnum cartridges such as the 7 mm Shooting Times Westerner, the .300 Weatherby Magnum, .340 Weatherby Magnum and the .375 Ackley Improved. 300 Remington Ultra Magnum
The .300 RUM features a rebated rim much like the .300 Canadian Magnum so as to allow the cartridge to function in the Remington M700 action without having to increase the bolt and bolt face diameter of the action. Unlike the belted Magnum cases based on the .375 H&H Magnum cartridge, the .300 RUM does not have a belt. All things being equal, a beltless cartridge would feed more reliably and more smoothly than a belted cartridge. 300 Remington Ultra Magnum
The Premier Scirocco Bonded line is some of the most versatile and reliable big-game ammunition offered today. The expansion-generating polymer tip and boat tail base combine to defy air resistance at the front end, and reduce drag at the back. The progressively thickening, heavy-based, pure copper jacket is bonded to the lead core to preserve bullet integrity and retain over 75% of its weight at all velocities. Finally, the bullet’s precise concentricity and secant ogive nose profile produce accuracy you would be proud of in match competition.
Remington reintroduced its Premier Scirocco Bonded (RPSB) line of ammunition in late 2018. As a result of Remington’s bankruptcy and subsequent division, the ammunition operations are now owned by Vista Outdoors — the same parent company as Federal Ammunition.
RPSB loads continue to be produced. Loaded with Swift’s Scirocco bullets, which were introduced in 1999, this ammunition still offers big-game hunters dependable performance today.
Before we discuss RPSB ammunition, I’d like to offer my views of what constitutes so-called “premium” ammunition. 300 Remington Ultra Magnum
First, I don’t put a lot of stock in the cosmetic treatments often applied to “premium” ammunition. I have never seen compelling evidence that bullet coatings actually benefit performance or offer meaningful barrel fouling reduction.
Nickel-plated cases offer some corrosion resistance and possibly easier extraction, but those aren’t usually serious issues for hunters outside of high humidity and salt-water environments such as those found in coastal Alaska. 300 Remington Ultra Magnum
Where I think the rubber meets the road for premium ammunition is the bullet, which should provide top-notch terminal performance or accuracy — and preferably both.
Premium ammunition should also be loaded to tight specifications for low bullet runout, uniform cartridge overall length and high levels of performance uniformity. Lastly, premium ammunition should be loaded with a temperature insensitive propellant.
There are a number of good choices for propellants that meet this standard including the Hodgdon Extreme line and Alliant Reloader propellants such as RL-16, -23, -25 and -33. With these requirements in mind, let’s examine RPSB ammunition and see how it measures up.
As mentioned, the RPSB ammunition is loaded with Swift Scirocco bullets. Sciroccos have been around for nearly 30 years and have garnered an enviable reputation for effective and reliable terminal performance.
In design, it features a drawn jacket with a bonded core and polymer tip. Bonded bullets often use jacket material that is nearly pure copper in order to get a good bond to the lead core. This makes the jacket a little softer than the copper alloys of non-bonded bullets, which is why you see thicker jackets on most bonded bullets.
The extra material is needed to control expansion. The thick jacket aids terminal performance, but can compromise accuracy due to the difficulty in achieving uniform wall thickness.
Generally, bonded bullets are perfectly capable of producing acceptable hunting accuracy, but not necessarily top-shelf accuracy. The Scirocco bullets conform to this rule of thumb.
Sciroccos offer excellent weight retention and dependable expansion and terminal performance down to velocities of about 1,800 feet per second (fps).
The short, steep boattail on these bullets is essentially an aid to loading and offers almost no aerodynamic advantage over a flat-base bullet. As my testing showed, the Ballistic Coefficients (BC) advertised for the bullets is on the optimistic side.
That said, the black polymer tips improve BC and facilitate reliable terminal performance. So, overall, Remington made a good choice by using Swift’s bullets in their hunting-oriented RPSB lineup.
Remington offers Premier Scirocco Bonded ammunition in a range of calibers and weights: .243 Winchester, 90 grains; 6.5 Creedmoor and .270 Win., 130 grains; 7mm Remington Magnum and 7mm Remington Ultra Magnum (RUM), 150 grains; .308 Win., 165 grains; .3006 Springfield and .300 RUM, 150 grains; and .300 Winchester Short Magnum (WSM), .300 Winchester Magnum (WM) and .300 RUM, 180 grains. Cases are non-nickeled brass and primed with appropriate Remington Kleanbore primers.
For testing, I received ammunition in 6.5 Creedmoor, .308 Win., .3006 and .300 WM. The only load that had an extruded stick propellant was the .300 WM load. The other three were loaded with Ball propellant. This was a little disappointing for a premium line of ammunition since Ball propellants can be temperature sensitive and will lose or gain substantial velocity at temperature extremes.
The 6.5 Creedmoor RPSB load is advertised at a muzzle velocity of 2,750 fps with a BC of .570 (G1). The loaded round runout of this load measured .001 to .004 inch with 85 percent of them between .002 and .003 inch. This is quite good for factory ammunition. The COL measured 2.732 to 2.74 inch, which is also very good. It is loaded with 42.7 grains of Ball powder.
The ammunition was tested with a Thompson/Center ICON having a 24-inch Bartlein barrel with 1:7-inch twist and a Nightforce NSX 5.5-22X scope.
This gun can be counted on to shoot better than 1 MOA with good ammunition. As Tables 1 and 2 show, the muzzle velocity was above advertised values and the actual BC was well below. The velocity extreme spread (ES) of 87 fps leaves room for improvement.
Averaging 1.02-inch groups, accuracy is good for factory ammunition and more than acceptable for traditional-range hunting. The combination of accuracy and bullet terminal performance would make this load effective on deer-size game out to about 550 yards. This load would serve the typical American hunter well.
The .300 WM RPSB load is advertised at a muzzle velocity of 2,960 fps and a BC of .507 (G1). The loaded-round runout of this load measured .001 to .004 inch with 80 percent between .001 and .002 inch.
Again, exceptionally good, especially for the short-necked .300 WM. The COL measured 3.304 to 3.316 inches, which is reasonable for factory loaded ammunition. It is loaded with 69.8 grains of a stick propellant, a necessary choice as Ball powders can have extreme temperature performance variations in magnum cartridges.
The ammunition was tested from a stainless Remington Model 700 with a 24-inch barrel and a Leupold VX-5HD 5-20X scope. Shooting this load was frustrating. I consistently thought I had a good group going and then would get an uncalled flyer.
For this load, I shot several extra groups but I continued to produce flyers ruining otherwise good looking three- or four-shot groups. Tables 1 and 2 show the muzzle velocity was above advertised. The extreme spread of 55 fps is good for a factory loaded magnum cartridge, and the actual BC was significantly lower than advertised.
The bullet’s terminal performance would make this load effective on deer size game out to 750 yards. However, in my opinion, the accuracy performance of this load would limit it to 450 to 500 yards — maximum.
- Precision shaped polymer tip for reduced frontal air resistance
- Secant ogive bullet profile for high ballistic coefficient
- Jacket and core bonded together to eliminate jacket/core separations
- Boat tail bullet design for reduced air drag
- Excellent terminal performance with deep penetration and high weight retention
Made In United States of America
|300 Remington Ultra Magnum
|3250 Feet Per Second
|4182 Foot Pounds
|Bonded Polymer Tip
|Bullet Brand And Model
|Swift Scirocco II
|G1 Ballistic Coefficient