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Large Rifle Primer
Based on the .308 Winchester, the .358 Winchester was introduced by Winchester in 1955 for use in lever- and bolt-action rifles. While it has not seen as widespread popularity as other .308-based cartridges, its brush-busting capability still makes it an excellent choice for hunting any of North America's big game. With the recent rise in popularity of AR-10–style rifles, the .358 Winchester is starting to be chambered in them because it gives the AR-10 a little more thump than the .308 Winchester.
**WARNING** In firearms that use a floating firing pin (such as the AR-15 and its variants), dropping the bolt on a chambered round could lead to a slam fire. It is important that these firearms are loaded from the magazine so that the bolt loses inertia when it strips a round from the magazine. It is also important NOT to use sensitive primers that aren't designed for use in an AR, as this increases the chance of a slam fire.
