Delightful result. I congratulate.
I have rummaged their message a site and have not found such cartridge.
All cartridges begin with SB
Product No.?
http://www.sellier-bellot.cz/

62 gr - is not present in their lists.
Another can at you other cartridges and firm?

Bulk Lake City Arsenal .223 SS109 Ammunition
Shoot the same ammunition that our troops abroad trust their lives to in these bulk-packaged .223 rounds. Manufactured in the USA by Lake City Arsenal, this overrun of ammunition is not remanufactured or below-spec rounds. The 62-grain, steel-core M855 Green Tip Penetrator is the same firepower supplied to our elite units, including the Navy SEALs. Stringent military standards ensure reliable, consistent performance for your target shooting and varmint hunting. Muzzle velocity: 3,070 feet-per-second. Includes six .50-caliber, military-surplus ammo cans. Per 2,000 rounds