The 7mm Remington mag and the .300 Winchester mag are exactly the same case, belted and based on blowed out, shortened version of the old .375 H&H case. The ONLY 2 differences are neck diameter and length of case. In fact, the 7mm mag & .338 mag are exactly same case except for neck diameter of course. There's NOTHING wrong with the 7mm mag, and is an EXCELLENT canidate for an all-round rifle-especially if you reload. Naturally when you reload once fired cases, you headspace on shoulder instead of the belt. The 7mm mag offers great killing ability for it's mild recoil.