The most famous gun associated with the .45-70 cartridge is the iconic "Trapdoor" Springfield Model 1873. This single-shot, breech-loading rifle was the standard-issue firearm for the United States Army during the late 19th century.

The Trapdoor Springfield was named for its unique hinged breechblock, which opened like a trapdoor to allow for the insertion of a new round. The rifle featured a long barrel and a sturdy stock, making it well-suited for the powerful .45-70 cartridge.

The rifle's design and use of the .45-70 cartridge made it a symbol of the Old West and frontier life. It played a significant role in various historical events, including the Battle of Little Bighorn. The Trapdoor Springfield became synonymous with the brave soldiers and settlers who ventured into the wild and unpredictable frontiers of the American West.

The historical significance and association with the Trapdoor Springfield have solidified the .45-70 cartridge's reputation and made it an integral part of firearms history. Today, the .45-70 remains a popular choice among firearms enthusiasts for hunting, target shooting, and as a tribute to the Old West.