I guess as 80 years old I qualify as "Grandpappy" and I killed several Columbian Blacktails with a .32-20 Savage bolt action (before I discovered that it was an illegal caliber in CA at that time!). During and after the Depression and WWII there were many country people in rural CA who had only one "real rifle" and it was often a .32-20 or 25-20. They got used for everything a rifle could be used for. I suspect that might have been the case with the.310 in OZ once the training rifles were surplussed.