I have 2 pistols I want to order molds for & need your thoughts.  One is for a .410 GNR hand gun and the other is .510 GNR.  I would guess for the .410 GNR something in the 250-265 range WFN and for the .510 GNR a 350-400 WFN.  Anything can change just your opinion as far as nose type and weight.  They would have to be gass checked.
Best regards,
Dan Kirkwood