Sure, you know .45-70, but do you know .45-70 Auto from an AR platform?

The good old black powder .45-70 Government was developed at the U.S. Army’s for use in the “Trapdoor” Springfield Model 1873 and has been a go-to round for going on 150~ years in both rifles and Gatling guns. Although the military moved on to smokeless powder after the Spanish American War in 1898, where the .30 Government in its various forms was adopted, the .45-70 was still in use by the military as the M32 blank round for line throwing rifles in the Navy and Coast Guard well through WWII and the full-rated pill with its big lead bullet has been popular with hunters and long-range target shooters since the days of Buffalo Bill.

Now, Colorado’s Phoenix Weaponry has a custom AR-10 platform that has been greatly modified to fire a similarly tweaked .45-70 round in semi-auto. The smokeless powder (48 grains of IMR 4198) loaded cartridge uses a 325-grain Hornady FTX bullet on a rebated rimmed case– the whole thing dubbed .45-70 Auto– to bring impressive performance from the AR platform of the same name.

The PW .45-70 Auto, a smokeless-loaded rebated rimmed .45-70 Government

45-70 Auto (325 gr) next to a .458 SOCOM (350 gr) and .45 ACP (230 gr)

PW gets 6 rounds of .45-70 Auto into a 10-shot Magpul AR10 mag and they advertise sub-MOA performance out of the platform.

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About laststandonzombieisland

Let me introduce myself. I am a bit of a conflict junkie. I am fascinated by war and warfare, assassination, personal protection and weaponry ranging from spud guns and flame throwers to thermonuclear bombs and Soviet-trained Ebola monkeys. In short, if it’s violent or a tool to create violence it is kind of my thing. I have written a few thousand articles on the dry encyclopedia side for such websites as, University of Guns, Outdoor Hub, Tac-44, History Times, Big Game Hunter, Glock Forum, Firearms, and Combat Forums; as well as for print publications like England Expects, and Strike First Strike Fast. Several magazines such as Sea Classics, Military Historian and Collector, Mississippi Sportsman and Warship International have carried my pieces. Additionally I am on staff as a naval consultant and writer for Eye Spy Intelligence Magazine. Currently I am working on several book projects including an alternative history novel about the US-German War of 1916, and a biography of Southern gadfly and soldier of fortune Bennett Doty. My first novel, about the coming zombie apocalypse was released in 2012 by Necro Publications and can be found at as was the prequel, Chimera-44. I am currently working on book two of that series: "Pirates of the Zombie Coast." In my day job I am a contractor for the U.S. federal government in what could best be described as the ‘Force Protection’ field. In this I am an NRA-certified firearms, and less-than-lethal combat instructor.

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