7.65x21 Mauser "DWM K 471 K"

I got these in a bag without a box. The hollow point is filled with glue like material. Is it just a lubricant or it is hiding something inside?

7.65 Parabellum
iaaforum.org/forum3/viewtopi … 8&start=15

Thank you for catching my mistake. I see that municion.org has 2 variants of this, one with period (471.) after 471, another without. Any meaning to this period? Mine all have periods.