I would start at 14.0 to 14.5 grains of Hodgdon H110, or Winchester 296 for an M1 carbine with a 100 or 110 grain FMJ bullet. I have never shot this load through a M1, but it should work just fine, many people use W296/H110 in the M1. It's about as hot as I feel comfortable with in the Automag III.
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I get 1600+ FPS from this load across my chronograph. 30 carbine brass, an OAL of 1.680, and a CCI #450 magnum primer. My hottest, and most accurate pistol load for my Automag III uses either a 110 grain jacketed bullet, or a 100 grain soft point and 15.4 grains of an old lot of Winchester 296 powder (still in the metal canister) with Lake City. I would have no misgivings shooting this load through my M1 Carbine as well This load gives me 1500 FPS from my Automag III, and also no pressure signs, using a CCI small rifle primer again for consistency. Hercules/Alliant 2400 powder at 13.1 grains, with a 110 grain jacketed bullet and an OAL of 1.680. I would feel comfortable shooting this load in my M1 Carbine rifle as well. This load gives me 1550 FPS out of the Automag III, and no pressure signs. 30 carbine using 12.8 grains of AA#9 and a CCI small rifle primer with a 110 grain jacketed bullet. I have had decent results using Accurate Arms #9 in. Wait a minute, what does need have to do with it? Don't need a 50 Cal auto, have that covered in a wheelgun. You have my interest peeked on this set-up. 30 Carbine? I load for my Dad's M-1 and am curous of there are some really good loads for an AMT in this caliber. The AMT III in 30 carbine is an interesting pistol, and it’s a hoot to handload for, but man is it LOUD, I’m talking ear plugs and muffs loud. I figured it would be a good companion to a M1 30 carbine, sort of like the Ruger 30 carbine Blackhawk revolvers. I could still get an Automag III back then, so I ordered an AMT Automag III in 30 carbine instead.
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I kicked myself for years after that for not grabbing that Automag V when I had the chance. I asked my local gun dealer if he could order an Automag V for me at the time, and I found out that it was a limited run gun (very limited, like only 2000-2500 only got made before Arcadia Machine and Tool went under) and it was no longer in production. The Automag V always seemed like a simple, oversize, stainless steel 1911 to me. The gas port was impossible to get at on the DE, and I like to shoot cast bullets a bit too. I did not realize what a limited run pistol the Automag V was back then, and I never really liked the too large in the hand Desert Eagle. The guy who was selling it at the time, had won it in a contest, but he was kind of a jerk to deal with, so I blew him off and just decided I would order one from my local gun pusher.I believe back then the seller wanted $850 firm for the pistol because it was pretty new, and had only been shot a couple times. I have had my eyes out for a Automag V in 50AE ever since I saw one for sale at the gunshop I worked at back in the early 90’s. There were others which I am not sure as to what they were. IHMSA80x80 They had one 22LR and a 22 Mag.