The 300 Win Mag (300 WM) and 338 Win Mag (338 WM) both descend from the 375 H&H Magnum cartridge, although the 338 came out a full 5 years before the introduction of the 300 WM in 1963. In contrast, the 338 Lapua Magnum descends from the older 416 Rigby case, which was originally an African big game cartridge propelled using cordite.. Recoil. One of the disadvantages of both cartridges is that they produce significant recoil. The 300 Win Mag generates about 31 ft-lbs of free recoil energy, while the 338 Lapua generates about 52 ft-lbs. The 338 Lapua has a distinct edge in felt recoil, making it more difficult to shoot accurately without proper training and experience.

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Go with the .338, and you can leverage 250 grain or 300 grain rounds for bear if you ever get the urge. An 8 pound .338 though, you're a better man than me. I love my Ruger M77 .338 with a 24 inch barrel and Leupy 2x-8x on top, runs about 9.5 pounds. i'm happy to not go any lighter than that. Oct 30, 2018. #5.. Due to its longer case length and the difference in placement of the shoulder, the .300 Win Mag does have a slightly greater case capacity than the .338 Win Mag. On the other hand, the .338 Lapua is significantly longer than both Winchester Magnum cartridges. The Lapua cartridge also uses a larger, .588″ rim diameter.