Do you have a design?
1927 Japanese document here: http://www.frenchriverland.com/design_of_pelton_buckets.htm
another with ellipse: http://www.ku.edu.np/kuset/vol5_no2/5_pressure%20distribution_Binayakkc.pdf
Some Dimensions: http://staff.ui.ac.id/internal/132048279/material/FluidSystem08-ImpulseTurbine-PeltonWheel.pdf
Also, two nice pictures of front and back at CNCZone.