Just from your numbers, 4,75S.P. 28,5BL that would be 4 3/4 of powder S.P.( Schultze Powder ) & 28 1/2 grammes of lead.

Papp 16-65, 4 3/4 S.P., 28 1/2 Bl.

Cheers,

Raimey
rse