This ammunition uses two-piece stainless steel cases from ShellShock Technologies that Seismic says are lighter and stronger than brass.īecause of the internal geometry of the cases, these heavy bullets don’t actually restrict a tremendous amount of the available powder space. Part of the technology that allows for such a heavy bullet to be put into so small a case comes from the design of the case itself. That’s actually what makes this 185 grain ammunition so interesting.ĭespite having massive bullets, the individual cartridges are actually quite light. That’s not to say there are no good personal defense offerings in the 147 grain class, there certainly are, it’s just that for most carry guns you are not really at an advantage. The 9mm is typically best in a lower weight, high capacity role. If you’re really a cool guy, 147 grain bullets are about as heavy as it gets in 9mm, but you quickly begin to lose a number of advantages as you get up there. When it comes to the ever-popular nine millimeter round, the typical bullet weight is usually around 124 grains. The fired cases, while dimensionally the same, are constructed in very different ways. There are points to both that are worth considering. A wide bullet will lose the majority of its energy on impact and, due to greater surface area, will slow down much faster in tissue. In theory, the longer bullet will lose less energy on impact and drive in deeper into the target. 45 and a nine of the same weight is the sectional density and meplat of the bullet. The 185 grains of the Seismic 9mm round would on the low end of the weight scale for calibers like. There’s always been a longstanding argument between proponents of one caliber or another, with those discussions typically hinging on capacity versus bullet mass. ![]() ![]() The theory and effectiveness of heavy bullets isn’t something that should be foreign to most people. I was prepared to have them come out of the pipe at approximately paintball velocity.įor comparison, here are the rated velocities for some comparable 147 JHP rounds: Both velocities were faster than I imagined they’d be. The P365 came in slightly slower at 849 fps. To my surprise, my two test guns - a SIG P365 and full-size SIG M17 - delivered pretty decent velocity considering the high mass of the round. I was honestly expecting 600 fps or something. I was initially concerned that these large bullets would be going along at a very slow pace and wouldn’t really do all that much as far as terminal effectiveness. The manufacturer told me that this ammo was designed with carbine-length barrels in mind, but it’s a good option for pistols, too. There really isn’t a reason why it wouldn’t work It’s just that up until now, the technology hasn’t existed to allow for such a heavy bullet to offer expansion at handgun velocities. There is just so much bullet present that it’s actually hard to imagine all of it fitting in a 9mm case. That weight is heavy, even for longer cases like the. Some of you may wonder what a 9mm round is doing with a 185 grain bullet. Seismic’s heavyweight 9mm QuakeMaker +M personal defense load (+M means more mass) offers some pretty impressive features.
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