Auto Mag
I've read the comments so far, and some of them are correct, some are not. Before we go any further, lets set some things straight, so we reduce the confusion.
The gun we are talking about is the Auto Mag Pistol. (note two word name). The Automag (one word) is a DIFFERENT GUN! They are distant cousins, sharing a similar sounding name, and some bits of "family" history, but they are completely different guns, using completely different mechanisms.
AMT never made Auto Mags. AMT made Automags (II, III, IV, & V).
Now, on to some general history, and some specific points...
The .44 Auto Mag was the first modern magnum auto pistol. It was made of stainless steel, and used (what was, at the time) cutting edge space age manufacturing techniques.
The Auto Mag is recoil operated, and uses a multiple lug rotating bolt lock up, similar in appearance to the AR15/M16 rifles. By the standards of the day (1970s) it was HUGE, complicated, expensive, and used a cartridge not in common production by any major ammo maker.
What killed the Auto Mag, as a commercial proposition? Those saying cost, availability, and complexity (ammo, reliability, etc.) are essentially correct.
The reality is that it was always a niche gun, not something with a mass market appeal, and they never got all the "bugs" out of the design. SO, it was expensive, quirky, and didn't fit the buying public's ideas at the time.
AlSO, there were problems with the company that made them.
The first Auto Mags were made by the Auto Mag Corporation, located in Pasadena Ca. Harry Sanford was the gun who started and ran the company, and was credited as the gun's designer in articles about it.
They made some pistols and took orders and deposits for many more. Then they folded, without delivering or returning the deposits. (rumor has it some employee walked off with the money, and that's why they went under, but I have seen no proof).
Tomas Oil Company, bought the tooling and parts, and formed TDE (Trust Deed Estates) with the intent of finishing the stock of frames as completed pistols. They hired Harry Sanford to run the outfit.
TDE produced most of the Auto Mags, going well beyond just finishing up the existing frames, they made new guns, and even a new caliber, the .357 AMP (the .44AMP necked down to .357).
They were located in North Hollywood, CA. They also went under, eventually.
Lee Jurras (of Super Vel ammo fame) acquired exclusive distributorship rights, and some guns were made under his name. High Standard also made a few guns before the Auto Mag faded away.
As near as I can tell, somewhere around 5,000 Auto Mags were made, in total (some say double that, but I haven't seen any numbers on that).
AMT co. (Arcadia Machine & Tool) is a different company, which produced a different gun. The AMT Automag (III, IV, V) is a tilt barrel lockup design, essentially a modified Browning system. Automag II was a retarded blowback .22WMR.
Harry Sanford was involved with AMT, after the original Auto Mag production ended. The same guy, and a very similar name is where the confusion comes from, but the Auto Mag and the Automag are very different guns.
IIRC, the bolt was held in by two fairly small rods. I recall wondering what would happen if they broke or came loose somehow.
Those small rods below the bolt are the recoil spring guide rods, and if they break or come loose the bolt is still retained by the much larger bolt rotation pin (a cam pin very similar to the one in the AR15 design). Having either one, or both of he guide rods break / come loose will screw up the gun, but the bolt isn't coming back in your face from that alone.
It was the case of the last round he fired, and it was in the chamber backward! That accounted for the fact that the chamber appeared to be empty.
As best we could analyze the "problem", the gun fired, then the recoil caused it to catch up with the ejected case, which then somehow entered the chamber base first.
Had anyone told me that could happen, I would have been very skeptical, and I would not be too offended if some folks think I am drawing the long bow here, but it really did happen!
I have never had this happen with an Auto Mag, but
I HAVE had it happen to me, with an H&K 91 (.308) rifle! Fired case, rotated 180 degrees and fed back into the chamber! It's about unbelievable, and rare, but it can, and has happened.
Auto Mag brass could be made from 308/30-06/243 ect stock by cutting to length and reaming the case mouth
This is correct. RCBS made a case forming die set, a trim die, extended shellholder, and a reamer. Once formed, cases were loaded in a 4 die set (RCBS), which had a separate taper crimp die.
As to factory ammo, there was some. But not much. CDM (a Mexican ammo company, owned at the time 49% by Remington) made 1,000,000 (one million) loaded rounds. A few years later, Norma (Sweden) made small amounts .44 AMP ammo. I don't know how much, but back when TDE ammo was $35 a box, the Norma stuff was $56!
CDM cases were thinner than cases made from rifle brass, and loads MUST be adjusted accordingly.
Back in the 70s, when a S&W M29 msrp was $283.50, an Auto Mag was $395! I watched one on a dealers shelf for several years, and saw it go from $395 to $695! It was a long barrel .357, no vent rib. In 76, I saw two of them in one place, both standard ribbed 6.5" guns, a .357AMP and .44AMP, for $795, and $895, respectively. In 80, I saw another one, standard .44AMP, for $995.
Then Sudden Impact came out, and the price jumped to $1500, if you could find one. Today, they cost quite a bit more!
I got my first one in 83, and I can tell you a few more things about them, if you are interested. There are also other Auto Mag owners on the boards.
These are mine, two .44s and a .357. I also have the other magnum auto pistols, Coonan, Desert Eagle, LAR Grizzly, and Widley, if you're interested in hearing about them...too.