{"name": ".223 Remington SIERRA 77GR STMK SIERRA 77GR STMK", "productName": "", "caliber": "5.56mm NATO / 5.56x45 / 223 Remington", "bulletType": "", "bulletVendor": "", "cartridge": "SIERRA 77GR STMK", "cartridgeVendor": "", "url": null, "country": "", "bc": null, "g7": null, "weight": null, "muzzleVelocity": null, "author": null, "note": null, "extra": null}