This means that the momentum of a rifle's reaction will exactly equal the momentum of the bullet and powder gasses ejected from the barrel. I have had good results with H1000 in the 338 RUM, it will be plenty full though. By Chuck Hawks. Follow on Instagram. I started thinking about the 338-Lapua instead? I would think that belted Weatherby cartridge has some draw backs due to the head spacing issue...i.e.….little more finicky on accuracy, pertaing to the double radii. If one is after long shots, then the RUM, Lapua and the king of them all, the 338-378 Weatherby. Both of ours are extremely accurate. For a better experience, please enable JavaScript in your browser before proceeding. Mag is outstanding. Post. 340 WBY the cost of brass is the bigest issue it is made by Norma and is very consistant but a bit soft if you use max loads. The .338-378 Weatherby cartridge uses the .378 Weatherby case, necked down to take a .338 bullet. my understanding is this is not the case.no pun intended. The 338 RUM is only slightly smaller in case capacity then the 338 Lapua and the 338 Edge (Shawn C.s brain child) is a bit larger in capacity and can be used in vastly more actions. Big-game cartridges in .338 caliber have become popular, including the (1) .338 Winchester Magnum, (2) .340 Weatherby Magnum, (3) .338 Remington Ultra Mag, (4) .338 Lapua and (5) .33 Nosler. I currently have a Sako 75 in 300WSM that I've taken multiple cow elk from 250-450 yards. The 338-Lapua would be a handload only rifle. The .338-378 Weatherby case holds 137 grains of water compared to the .338 Lapua, which holds 114 grains of water. How it actually performs though is another thing. Both the .338 RUM and .338 Lapua are loaded to pressures of between 60,000 and 62,000psi. Shooting the 260gr Peregrine Range Master out to 2000 meters from a 338-378 Weatherby Magnum. The .340 Weatherby is somewhat similar to other super .338's (.338RUM, .330 Dakota, .338 Lapua, .338-378 and so forth, not necessarily in relation to case dimension, but to the fact that all of these can shoot quite fast and use the same bullets. I have a 338RUM in an HS-Precision and it shoots great. In true Weatherby fashion, the .340 generates velocities almost 300 fps faster than the .338 Winchester Magnum, and brings a correlative amount of recoil as well. of energy at the muzzle, the .340 Weatherby is a serious cartridge which will test the mettle of any bullet, as well as test the abilities of any … Also, there is the issue of limited or sporadic availability of these cartridges. Short Belted to the.338 Win. I'm not a reloader. Shooting groups with tumbling bullets!?!? Others have mentioned cheaper brass, a little more speed, non belted case.........all are positives. Having said that, there are several guys who shoot the 340 Wby and love it. This one still features a .338 bullet, … Trueth is, the 338 Lapua was at one time the end all of long range factory rounds. Mag. No kiddin, I'm thinking the same thing. Thanks for all the good info, I have ordered the 338 RUM today, and waiting for its arival. Browse our extensive selection of firearms and accessories on BudsGunShop.com. I thought my 300 RUM with 220g's at 3000fps out of a 9.5lb rifle was quite a bit. Like the .338 Lapua, it is a great candidate for the 300 grain long-range … I have never found it difficult to load for at all. While it may not have a particularly large following in the hunting community, the military/LE/tactical community are enamored […]. The .340 Weatherby currently maintains limited popularity and could perhaps be called a classic cartridge. AND, the Nosler 33 fits in a standard, long action receiver. Use our advanced product search tool to find exactly what you are looking for! The similarities of the.333 O.K.H. The 338-378 Weatherby, is making over 720 ft lbs more energy with the same weight bullet. Brass is cheaper for the RUM. Theres no way you could get me to touch that off! I can buy factory ammo for both the 338 Rum and 340 Weatherby, which has made me stick to them and not go with a 338 Edge Just look at the amount of powder that can be loaded into the .300 Win Mag vs .338 Lapua Magnum. A few fps slower for the RUM and a few fps faster for the Lapua, but they are essentially the same. Apparently, the .338 Norma Magnum is quite the shooter, although case capacity is slightly lower than the .338 Lapua Magnum. Velocities are identical to the standard .338 Lapua loading consisting of a 250 grain bullet at 2950fps. The ball… Please note, the following information reflects the estimated average ballistics for each caliber and does not pertain to a particular manufacturer, bullet wei Both my father and I have .340wby's. So does anyone have any ideas on powders and loads that I could start around for the Barnes 210's or 225's? I have the 338 RUM in 700 action 26" barrel. 338 RUM if you have to be able to use factory ammo 3. The .338 is also able to be fitted with much heavier bullets than the .300 Win Mag rounds. The.338 Win. On the extreme end, the 338-378 Weatherby and on the other end of the the Weatherby spectrum, the 340 Weatherby which is excellent. Long Belted to the.340 Wby. The only reason I even know about 340 weather is because my father is a weatherby fag and always talks about how the (insert oddball wildcat blah blah mag cartridge) is (insert … All content Copyright 1998-2018 Rifleshooter.com, FTC disclosure: some links on this site are monetized, Savage B22 Precision Rimfire Rifle Review, Beretta M1951 mystery- cutting our way to the truth, Gunsmithing: replacing a curved steel butt plate with a rubber recoil pad, Project Guns- Gunsmithing articles and posts. The .340 Weatherby was introduced to compete with the .338 Winchester Magnum which had a hold on the market at the time. The following ammunition cartridge ballistics information and chart can be used to approximately compare .300 Weatherby Magnum vs .338 Lapua Magnum ammo rounds. The .338 Lapua Magnum =2,850 FPS/ 4,560Ft Lbs energy. And 210 more fps. That’s about a 20 percent increase in case capacity. Practically there is little difference in these two rounds. Fortunately, there is a better, simpler way thanks to modern ballistic … The model I am looking at is the TRG hunting rifle (not the tactical model) with a 26"-barrel. Mine is about .4-.5 when I do mine. and of the.334 O.K.H. The 338 Lapua has a case capacity of 114.2 gr of water, while the 340 Weatherby- 98.0 gr, 338 Remington Ultra Mag- 113 gr., and the capacity of 338-378 Weatherby is 125 gr. December 3, 2017Bill Marr0. The 338's are easier to tune and stay in tune over a broad range of conditions. I don't have experience with the 340 wby but I have a 338 RUM, as do several of the guys here at LRH. Compared to the .340 Weatherby the .338 RUM has slightly greater powder capacity however .340 Weatherby Mark V rifles have a good magazine length and great freebore which in its own way increases velocity potential. You are using an out of date browser. I need some expertise in the reloading aspects or benefits and drawbacks for these two calibers: 338 Ultra Mag and 340 Weatherby. 340 Weatherby Magnum. My 200 gr Hot Cor bullets go 3260 FPS and my 225 gr Accubond bullets go 3178 FPS.I use RL25 powder. 338 Edge if you are going to reload and will not require the availability of factory ammo. Science to the Rescue. If one is to strictly use a .338 for a general rifle, then the 338 Win. It is capable of sterling accuracy. I will be using the Barnes X bullets for the elk the possibly looking at some other bullets for whitetails and hopefully an Alaska trip in the near future…(moose) I would like to know why I should sway one way or another….velocity, accuracy, ease of finding load, all the plus’s and minus’s if anybody has any experience in these two calibers. Search tool to find exactly what you are going to reload and will not require the 340 weatherby vs 338 lapua of these.... 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