Having read the books about Ernest Shackleton's exploration and misfortunes in antarctic I became very curious about the rifle he carried. At times they shot seals and penguins for food, and defended themselves from leopard seals. From what I can find in references the rifle was a Winchester 1895 like the one favored by Teddy Roosevelt. Does anyone know what caliber Shackleton's rifle was? From The complete angler and huntsman By Thomas Hubert Hutton, Stanley Blake it appears that at the time it could be had in .405 WCF or .30 Govt M-06 which I assume is 30-06. Any help or a guess would be appreciated.