7×47mm

7×47mm (seven-four-seven) is the standard-issue rifle cartridge of the SDC, meant as a compromise between previous-generation calibres 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.

7×47mm ammunition has an effective range of 1.55 kilometers with a 5.3 kilometer maximum range. M74 Standard has a velocity of 1.1 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.