Galactic Horizon 7.7x30mm is a smaller yet hard-hitting caliber of ammunition designed and manufactured by Galactic Horizon beginning in YE 41 for heavier sidearms and more compact rifles, available in both a supersonic and sub-sonic variant.
It can be easily considered the older “magnum” sibling of the company's eventual Galactic Horizon 7.7x15mm cartridge, with a nickel-plated brass casing and a solid block of premium-quality, high-velocity propellant. The supersonic variant uses a penetrating steel core beneath an anodized and Teflon-coated Durandium Alloy shell. The subsonic variant is very similar though uses different, heavier metals to maintain stopping power without breaking the sound barrier, with an anodized and Teflon-coated Skusten shell in place of the Durandium Alloy one and a Nerimium penetrator rather than solid steel. There is additionally a rarer self-defence variant of both types with a frangible nose to maximize the transfer of energy as well as a scored metal jacket to create a more vicious wound-channel via rapid expansion and minimize over-penetration compared to the more traditional design.
Funnily enough the slower, subsonic variant's Skusten outer shell makes it work exceptionally well with electromagnetic acceleration technologies, the frangible-nosed variant will travel just as far and be just as accurate though will suffer more shallow penetrative qualities than its more traditional counterpart.
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Galactic Horizon 7.7x30mm Subsonic
Galactic Horizon 7.7x30mm