7x47mm

From SSRP

7×47mm (seven-four-seven) is the standard-issue rifle cartridge of the Sol Defence Corps, meant as a compromise between previous-generation calibers of 5.56, 7.62 and 6.8. A rimless, bottlenecked cased design, the cartridge uses a durable lightweight polymer casing, a solid-block explosive propellant, and comes with multiple bullet types and pressure configurations for filling diverse roles.

Fulfilling both infantry and specialized roles, 7×47mm can be loaded into standard carbines all the way up to long-distance sniper rifles while retaining its extreme effective range and unparalleled stopping power, bested only by its bigger brother, 11×80mm.

7×47mm ammunition has an effective range of 1.55 kilometers with a 5.3 kilometer maximum range. M74 Standard has a velocity of 1.3 kilometers/second. The bullet is designed for minimal loss of energy over distance, greatly reducing bullet drop and dramatically increasing its effective range compared to predecessor cartridges.

Due to its polymer casing and lightweight propellant, 7×47mm is also much lighter than predecessors, with the whole cartridge only weighing 133gr (8.6g) with a 105gr FMJ bullet - almost 80% of the weight of the round is taken up by the bullet only. This does have the minor downside of making the bullet extremely top-heavy, so the primer base is given additional weight to counteract it.

With extremely high velocity compared to 21st century cartridges as well as a relatively heavy bullet, 7×47mm bullets deliver kinetic energy almost equivalent to .338 Lapua Magnum while retaining less than half the cartridge weight and much better ballistic performance.

Performance

7×47mm, compared to the preceding 6.8×51mm cartridge it replaced, possesses a 35% average increase in velocity and much higher effective range, allowing the new ammunition to be loaded and used as sniper ammunition.

7×47mm M74 Standard penetrates from 41 to 47 cm into soft tissue, while penetrating up to 18 mm of steel plating at up to 900 meters. Fragmentation rounds will always yaw and shatter when entering soft tissue, but is unable to penetrate steel plating at standard range.

With high range, stopping power and excellent weight, it forms the standard caliber as a jack-of-all-trades for most infantry roles against enemy infantry or light mechanized infantry, able to be loaded into sniper rifles, assault rifles, and machineguns alike.

Variants

Model No. Type Weight Tip Colour Description
M74 Standard 105gr None Alloy jacket with bismuth core. Standard-issue ammunition designed to perform against unarmoured to moderately-armoured targets.
M74T Tracer 105gr Red M74 Standard variant with red tracer tip.
M74AP Armour-Piercing 115gr Black Alloy jacket with tungsten carbide penetrator. Can pierce up to 35mm of steel plating.
M74APSBS Armour-Piercing Subsonic 120gr Black Short-range subsonic variation of M74AP. Lower pressure than M74AP but fires a heavier projectile, suitable for close combat and optimised for suppressor usage.
M74FR Fragmentation 108gr Blue Polymer-tipped alloy jacket with fragmenting core. Shatters into shrapnel when entering a soft target, causing devastating injury. Optimised against unarmoured personnel.
M74HE High Explosive 135gr Magenta Tungsten carbide penetrator with explosive core. Detonates upon impact with a target or midair via remote.
M74IN Incendiary 114gr Bright Orange Incendiary variant with phosphor charge tip. Upon impact, detonates the charge and sets the target ablaze. Due to its destructive ability, its usage is heavily regulated.
M74H Heavy 170gr Red/Black Brass jacketed M74 variant with red tracer tip. Commonly loaded into machineguns where stopping power is priority.
M74MK Marksman 112gr Dark Grey Match grade M74 variant with higher velocity and much higher accuracy. Used on DMRs and sniper rifles.
M74MKSBS Marksman Subsonic 118gr Dark Grey Reduced range subsonic M74MK variant for usage with suppressed, medium-range sniper rifles.
M74MKT Marksman Tracer 112gr Green/Black M74MK variant with green tracer tip.
M74ES Electroshock 80gr Yellow Nonlethal low-velocity M74 variant that discharges a disabling electric shock to a target upon impact, similar to a taser. Zero penetration capability but can deliver a shock through metal armour. Fielded by Peacekeeper personnel in civilian areas.
M74RB Rubber 75gr Black Rubber Nonlethal M74 concussion variant designed to disable a target via blunt force trauma. Commonly aimed at the legs or arms to swiftly disable a target. Can cause serious injury or death if fired at the head or ribcage.
M190 Blank 50gr White Explosive-only blank cartridge that does not fire a projectile. Used in training.
M182 Dummy 20gr White Polymer dummy cartridge used to test rifle actions.
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