#4010 - 458 HAM'R Brass
1.569 - 1.576 O.A.L.
The .458 HAM'R is a .458 SOCOM based caliber that was designed by Bill Wilson to push a 300 grain projectile 200 fps faster than the SOCOM. Due to limitations of the bolt and extension of the AR-15, the .458 HAM'R is chambered in a hybrid AR platform that utilizes a larger diameter bolt and extension. This allows the .458 HAM'R to reach its full potential while still being a fairly lightweight carbine. Complete guns are available at Wilson Combat, and standard .458 SOCOM loading dies can be used when adjusted higher to achieve the proper headspace.
**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.
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1 review
27 May 2024 20:00
Terry Hicks
I use the 458 HAM"R brass ins lieu of the 458 SCOCOM because of the the small rifle primers. I just resize them with the 458 SCOCOM dies. I use SMR primers with this size of brass. The brass last longer with the SR primer pockets and can improve accuracy.