The … Its enormous case capacity helps explain why. Mar 7, 2009 #1 . Twist Rate: 1:10” Barrel: Wiseman 338-378 Weatherby Magnum 338-378 Weatherby Magnum Maximum Loads Should Be Used With Caution - Always Start With Minimum Loads. Ironically, the .338 Lapua cartridge introduced much later became immensely popular and generated further interest in hot .338 magnums including the giant .338-378 Weatherby while the original .340 Weatherby continued to maintain a more modest following. "Weatherby 338" For Sale. *Most Accurate Load C Compressed Load 1. Upon making further improvements, the finish manufacturers made the .338 Magnum rounds compatible with semi-automatic weapons. Grand Rapids, Mi. The .338-378 Weatherby Magnum started out as the wildcat cartridge, .338-378 Keith-Thomson Magnum during the early 1960s.Keith and Thomson are Elmer Keith and R.W. Staying with 300 WM vs 300 WBY mag means the long action rifles in inventory can be converted much easier than the Weatherby version. Even the lowly .338 Winchester Magnum … The 338-378 Keith-Thomson Magnum is a quarter of an inch shorter than the full length 338-378 Weatherby Magnum, this was because they thought it was better balanced with the slowest powder available at that time. If one is after long shots, then the RUM, Lapua and the king of them all, the 338-378 Weatherby. On sale 338 Lapua Sniper Rifle Cost And 338 378 Weatherby Mag Vs 338 Lapua You can order 338 Lapua Sniper Rifle Cost And 338 378 Weatherby Mag Vs 338 Lapua afte Posts: 1,727. 338 vs 300 weatherby I would say the 338 winchester is a bit or much better for the tough brownies.. The .338 LM rounds are a larger caliber than the .300 Win Mag and have a slightly longer case and overall length. Yes indeed it's better than a .338 Lapua. Don't forget the .340 Weatherby, .338-.378 Weatherby, 8.59 Galaxy, 330 Dakota, .338 Canadian Magnum, .338 A-Square, .338 Excaliber and finally the 8.59 Titan. .338 Lapua, 7.4%.338-378 Weatherby, 10.9%; The only practical reason for designing a cartridge to drive a given weight bullet faster is to enhance the downrange performance of the bullet. 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. Campfire Ranger. All Mark V® rifles are guaranteed to shoot a 3-shot group of .99” or less at 100 yards (SUB-MOA) from a cold barrel when used with Weatherby® factory or premium ammunition within Two-Years of Verified Purchase Date to Original Purchaser. .338 edge is a formed 338 RUM or from the .300 RUM brass, formed from fire forming. 2,088 Posts #3 • Feb 2, 2009. 300 Win Mag vs 338 Lapua vs 338 Win Mag: Cartridge Sizes The shared heritage of the .300 Win Mag and .338 Win Mag, as well as the unique roots of the .338 Lapua, is obvious in the photo below. Campfire Ranger. salmonhead OP. Weatherby ammo is similarly expensive and only a few places load for it. Instead of using a 2.50-inch case to take advantage of the .30-06-length receiver, Roy decided a magnum-length case and receiver was warranted. 338 lapua = mimics a max pressure/hot 338 winchester, a very over hyped waste of money. I am not sure that I would have any weatherby and especially the 300 it is no better than the 300 win. More capacity means more propellant and more propellant means higher … LOW PRICES 338 Lapua Savage Pre Fit Barrel And 338 378 Weatherby Mag Vs 338 Lapua. The 215 magnum rifle primer was developed by Federal specifically for this round. 338 Rum is where the .338 gets interesting..as far as ballistics go and its the cheapest 338 hot rod to shoot.. 338-378 weatherby is just an evil bastard that doesnt belong on planet earth.. theres actually some loadings with H1000 or RL25 that put the 300gr smk at 2950 . The .338-378 Weatherby is currently the most powerful .338” factory cartridge. The 338 Lapua wins due to ease of acquiring brass. As the name implies, Weatherby's ultimate .338 is based on a necked-down .378 Weatherby Magnum case. When we look at the cartridge specs for the .300 Win Mag vs .338 Lapua Magnum we see some immediate differences that will likely lead to differences in how these two cartridges perform. That’s about a 20 percent increase in case capacity. 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