338-inch diameter bullet, and shaped a 25-degree shoulder to blend the two. Engineers shortened the 375 brass from 2.85-inches to 2.5-inches, took much of the taper out of its body, squeezed its neck down to hold a. Winchester’s idea was to modify this long, belted, magnum case so it would function in the Model 70’s 30-06-length “standard length action,” yet provide more powder capacity than the 30-06 Springfield by way of its larger diameter. Mag., Winchester’s 338 magnum sprang from the 375 H&H Magnum case of 1912. to fully appreciate this outstanding big game round. Let’s pry into the history and performance of the 338 Win. Zeroed at 200 yards, those powerful slugs drop little more than a 180-grain bullet from the 300 Win. churns out the kind of kinetic energy that makes an elk lie down and take notice, yet not so much recoil that it makes elk hunters flinch in anticipation. That, of course, is just my opinion, but I don’t think I’m alone in it. Since Winchester introduced it in 1958, this belted magnum round has slowly but steadily proven itself as the best balance between shootability and lethal terminal performance of any current production cartridges employed in elk habitat. Most have never seen commercial production, but the 338 Win.
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