Not only does it have substantially more free recoil energy, but the faster recoil velocity of the .300 Remington Ultra Mag makes for a sharper “kick.” Added together, the result can be tooth rattling recoil. So, even though the 300 RUM does have some significant advantages on paper, those advantages must be weighed against the very real downsides of the cartridge. .338 Remington Ultra Magnum (RUM) 300 Grain Nosler AccuBond- The .338 Remington Ultra Magnum is a .338 caliber rifle cartridge introduced by Remington Arms in 2002. .300 Remington Ultra Magnum (Hodgdon Retumbo Data) reloading data with 12 loads. Then select your bullet weight, powder manufacturer and powder type. Went with the temp stable Retumbo and H 1000 which were consistent in the weather here, whether practicing in the valley or at 6500' in the mountains. ALL 185 gr 200 gr 210 gr 215 gr 225 gr 250 gr 275 gr 300 gr. Good luck The same goes for hunting game like blue wildebeest, kudu, and eland in Africa or game like nilgai in south Texas. So, what was Remington trying to accomplish when they released the .300 Remington Ultra Magnum in the late 1990s? While not extremely popular in absolute terms, the 300 Remington Ultra Magnum does have a somewhat dedicated following and there is a pretty good supply of 300 Ultra Mag ammo. Powders include Hodgdon This might not be an issue for some hunters, but typical 300 RUM barrel life is usually significantly shorter than typical .300 Win Mag barrel life. The .300 RUM undoubtedly deserves the “Ultra Magnum” moniker, but that incredible performance does come at a price. Since there’s so much overlap in their common bullet weights, rifles for both cartridges typically use a 1:10″ rifling twist. It’s a plain and simple fact that the 300 Ultra Mag has more recoil than many hunters can handle. Having a properly fitted and well designed stock with a good recoil pad can mitigate felt recoil to a certain degree. Facebook; Twitter; Instagram; Youtube; Sign in to follow this . Open up the load data page you wish to download. Make no mistake: the .300 Remington Ultra Magnum is an excellent cartridge. Since it has a longer (2.85″ vs 2.62″) and larger diameter (.550″ vs .513″) case, the .300 Ultra Mag also has about 25% more case capacity than the .300 Win Mag. However, the .300 Ultra Mag also has a lot more recoil than the .300 Win Mag. Make sure you wear ear protection if you go that route! Love the thing and red deer as well, Hi Allen. Joined … Pistol; Rifle; Cowboy; GR. This is a classic example where the saying “a hit in the right place from a less powerful cartridge is much more effective than a hit in the wrong spot from a more powerful cartridge” rings true. The table below compares 180gr Nosler AccuBond (.507 BC) loads for each cartridge. The data used to compare the trajectory and recoil of the cartridges was obtained from Nosler (here, here, and here). The magnum era in North America kicked off with the introduction of the 7mm Remington Magnum and .300 Winchester Magnum in the early 1960s. Look no further than the Berger Bullets Reloading Manual. Make sure you follow The Big Game Hunting Blog on Facebook, Instagram, Twitter, and YouTube. The chart below compares how much a 10 mile per hour crosswind impacts those same loads for each cartridge out to 500 yards. Note that most rifles chambered in .300 Ultra Magnum typically have a longer barrel: typically 24″ or 26″. Get a rifle with a good recoil pad and a stock that fits you properly, learn to shoot it accurately, and I’m sure you’ll be happy with how it performs for you afield. Finally, since it uses the same .308″ bullet size that’s also used by the .308 Winchester, .30-06 Springfield, .300 Win Mag, and .300 PRC (among others), reloaders have access to a good number of outstanding quality bullets in the 180-220 grain range suitable for use on a wide variety of game to choose from. How does it do against dangerous game like milk jugs? Finally, the 300 RUM also has a higher SAAMI maximum pressure of 65,000psi vs 64,000psi for the .300 Win Mag. The Lyman 50th Edition (p260-262, p263-264) and Hornady 10th Edition (p574-585, 596-607) reloading manuals provided information for the history of 300 Win Mag and 300 RUM as well as data used to compare their size. You can also click on the image and a pdf version will open in a new window. Never begin loading with the maximum powder charge shown in these reloading data tables, regardless of your experience. .300 RUM (Remington Ultra Magnum) - Manufacturer Loading Data. I believe the load was 75.0gr for about 3,100fps. Thread starter cmahoney; Start date Mar 21, 2020; Mar 21, 2020 #1 cmahoney Senior Member. charge weight in grams and grains as well as muzzle velocity in meters and feet per second. With bullets 180 grs and up H870 and AA8700 are simply great and will top slow extruded powders by 100 fps at lower pressures in a 26 inch bbl.accuracy can be superbe. This does make the cartridge a little bit more forgiving of range or wind estimation errors than the 300 Win Mag. That translates into a flatter trajectory, a little more resistance to wind drift, and more kinetic energy at typical hunting ranges. 1. John. CPG 300 RUM 26" Brux with side discharge brake. .338 RUM (Remington Ultra Magnum) - Manufacturer Loading Data. GMX® 30-06 Springfield 125 gr. Some Remington's have 24" bbls and velocities are down about 125fps from my listed figures). There is currently a decent, but not gigantic, selection of high quality rifles available for the 300 Remington Ultra Magnum. On the other hand, the fact that the .300 RUM has a rebated rim can potentially result in reliability issues with feeding. John. I've also had great success with 180 Nosler partitions at 80.7gr 4350. i dry fired it twice wondering what was wrong before i heard the rattle of the smaller round in the chamber. Powder ALL Alliant Powder Reloder 19 Alliant Powder Reloder 22 Alliant Powder Reloder 25 Alliant Powder Reloder 33 Hodgdon H1000 Hodgdon H414 Hodgdon H4350 Hodgdon H4831 Hodgdon Hybrid 100V Hodgdon Retumbo Hodgdon … ALL 110 gr 130 gr 140 gr 150 gr 155 gr 165 gr 167 gr 168 gr 170 gr 180 gr 185 gr 190 gr 200 gr 220 gr. The .300 Ultra Mag can fire the same weight bullet approximately 200-300fps faster than the .300 Win Mag. Some companies, most notably Remington, have manufactured .300 Ultra Mag ammo of varying power levels. Mag has more recoil than the.300 RUM undoubtedly deserves the “ Ultra Magnum ” moniker, but rifle... 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