Once upon a time I took 8 or 10 field points, drilled holes in a board to stick them in, then melt lead, pour into the field tip "molds". Then you can trim the little cones to what ever length/weight with a short taper.
Now days I drill a 1/8" hole about 1.5" into the shaft before tapering. Using 1/8" brass, alumunum, steel, or even tungsten I can adjust them over a wide range of weight.....O.L.