23 RP riot control ammo

From the heart of Catskill Mountains (Saugertis Fish & Game swap show, near original Woodstock concert location) comes this not so lethal ammo. What is “23 RT”?

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You’re kinda in my wheel house but my lawn is calling

Photo has differing logos. Even without and green mil spec too

RP. Rubber Pellet. Later became Rubber Ball