My 270gr 44cal cast boolit is a SAECO#44439 240gr Keith type SWC
Gas Check design... Mine weighs 270gr because the gas check part
of mold was eliminated. lt gives the boolit added weight at the
base. Called ''beagling''- This is a common practice done to GC
molds. l bought the mold 'used' off the net. l suspect it was a
custom factory order because there are no additional machine marks
where the GC shoulder or step was originally. The box also says
'custom'. Many shooters like Elmer Keith preferred the wadcutter
shoulder of this design.. Cuts paper well and meat even better,,
according to 0le Elmer