.41JMP & .357AMP case forming |
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Pasadena-Joe
International Auto Mag Joined: 08 Jul 2016 Location: Interwebs Status: Offline Points: 171 |
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Not as much an issue of accuracy. Oh sure it might have some effect on accuracy, but your bigger issue is pressure.
Different brass has different internal capacity and will hold more or less powder and also change the powder to empty space ratio changes which causes the pressure to change, and in an AutoMag it changes the cycling. This has been discussed here many times. DONT mix brass for AutoMag ammo. Not my words, warning from much smarter people than me. Or don't pay attention and break you gun,but dont say you never heard of it. Like I said its been discussed here on on other sites many times. -Joe |
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CrazyLarry
International Auto Mag Joined: 27 Sep 2017 Status: Offline Points: 128 |
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YES!!! ISW is your friend... I was using this for my 300 Savage from cut-down 30-06 cases. This is such a great case lube, never had a single stuck case with it and a little goes a long way. But I did cut down to just below the neck of the cases, then annealed it so that the rest of the procedure was easier. The really tedious part was trimming to length those 30-06/300SAV cases and then neck turning them. We loaded up around 200 or so some decades ago. Had to fire form them with Red Dot and a wax plug and then finish them with some final case trimming. But, they are accurate... 3 rounds touching each other at 50 yards and easily through a spitzer into the pump station of a 7 point buck that year.
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Pantera Mike
Callahan's Auto Mag Joined: 20 Jan 2018 Status: Offline Points: 786 |
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Armed with my Imperial Sizing Wax and RCBS .357 AMP sizing die and expander, I’m in the middle of forming 500 cases this week. Sizing went fine (after establishing proper shoulder height per all the written guidance) and now I’m busy trimming using a rotary trimmer.
I just phoned CH4D to order a taper crimp die. RCBS only offers a roll crimp in their set but Kent Lomont and Lee Jurras were both adamant that a taper crimp is better, and since RCBS won’t make one, CH4D is it. I wound up engaging in a wonderful 30 minute conversation, as he had owned both a .44 and .357 at one point. He said his .44 used to routinely break (rear sight broke four times, barrel rib broke off) but he had no problems with the .357. Turns out he was friends with Kent Lomont and he had all sorts of wild man stories about him, including hauling 10,000 lbs of gunpowder for him from the Lake City plant to Kent’s house. It was a really pleasant conversation. Oh, and miraculously CH4D has multiple .357 AMP taper crimp dies in stock, no waiting! So hopefully I will be loading by this weekend. Back to the trimmer..... |
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jw4570
Callahan's Auto Mag Joined: 08 Mar 2008 Location: FL Status: Offline Points: 1319 |
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Mike, how much was that Taper Crimp Die going for?
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Pantera Mike
Callahan's Auto Mag Joined: 20 Jan 2018 Status: Offline Points: 786 |
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To be honest I forgot to ask! But his website shows it cost $56.45.
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Pantera Mike
Callahan's Auto Mag Joined: 20 Jan 2018 Status: Offline Points: 786 |
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The price on the website is the current price. It arrived today.
Just started loading with 158 gr Hornady XTP and various weights of WW 296 for experimentation purposes. You can see the taper crimp at the top of the case: |
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Luvz2Shoot
Callahan's Auto Mag Joined: 16 Apr 2011 Location: Washington Status: Offline Points: 618 |
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It was mentioned that RCBS won't make a crimper die. I was poking around and found that RCBS # 18262 is for a 38S/357MAG.
Would this be OK to use or do you need a crimper die specifically for the 357AMP? Thanks.
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If you were happy and you knew it, would you clap your hands?
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Pantera Mike
Callahan's Auto Mag Joined: 20 Jan 2018 Status: Offline Points: 786 |
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Remember that the .38 Special is a straight-walled case while .357 AMP is bottleneck. The .357 AMP case would never fit in a .38 Special crimp die unless you had it machined to match the contour of the AMP case.
I actually bought a .38 Special taper crimp die, assuming a proper .357 AMP crimp die would not be available, but before I had it machined I realized I could just buy the proper die from CH4D. So the .38 Special die went right back on EBay. Why try to turn a cat into a dog, when you can just get a dog? :) Despite the fact that the .357 AMP and .38/.357 use the same bullets, the actual outside case dimensions at the neck are different for some reason. I just loaded 250 .357 AMP rounds today and will do another 250 tomorrow. Fun!
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Luvz2Shoot
Callahan's Auto Mag Joined: 16 Apr 2011 Location: Washington Status: Offline Points: 618 |
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Thank you for clarifying. I did not know how far down the shell crimp went befor crimping the lip. I thought the crimp was (maybe) closer to the beginning of the die - not further up inside. I honestly had no idea.
Makes perfect sense and thanks for the info.!
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If you were happy and you knew it, would you clap your hands?
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jw4570
Callahan's Auto Mag Joined: 08 Mar 2008 Location: FL Status: Offline Points: 1319 |
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Yes, need to order from CH4D or I might have a 357 AMP set I could sell if someone really needed one (regular crimp from RCBS). I wouldn't break it up though. I don't think I have an extra crimp die for 357.
Jason |
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