I still believe that these .303 plastic bulleted rounds are for crowd control rather than indoor practice, and that "SEC" stands for "Securitie".
The blue short range rounds made by DAG in 9mm, 7.62mm and other calibres have just blue plastic bullets. The 9mm plastic bulleted rounds with the small steel ball in the tip are Swedish for sub-machine guns and quite different.
Regards
TonyE
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