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Old April 14, 2014, 11:51 PM   #1
Deja vu
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Looking for a 357 magnum load.

For bullets the only thing I could find is Hornady 110 grain JHP and Hornady 140 grain JHP. For powder the only thing I got is some new powder called Aliant 300MP and Trail Boss. I am looking for real magnum loads so it looks like I have to use the 300MP. I have found some loads out there but nothing for the bullets I have. Any advise?

I have Federal and Starline Brass and Federal small pistol (not magnum) primers and Winchester Small magnum pistol primers.
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Shot placement is everything! I would rather take a round of 50BMG to the foot than a 22short to the base of the skull.

all 26 of my guns are 45/70 govt, 357 mag, 22 or 12 ga... I believe in keeping it simple. Wish my wife did as well...
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Old April 15, 2014, 10:45 AM   #2
AlaskaMike
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300MP is a relatively new powder, and Alliant is notorious for having extremely limited online data.

My suggestion would be to find a local gun store that has printed manuals (hopefully those aren't as scarce as reloading components these days!). When you find a printed manual that has the data you want, buy it.
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Old April 15, 2014, 10:59 AM   #3
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Trail Boss is totally unsuited to .357 Magnum loads. Its not designed for that, and you simply will not be able to get enough Trail Boss in the case to reach magnum performance.

I don't know anything about the other powder, sorry.

Best advice I can give you is keep looking until you can get some 2400 powder. Win 296 or H110 will do as well.
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Old April 15, 2014, 02:55 PM   #4
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I would use this published data and interpolate between the 125 and 158 grain loads for your 140 grain bullets.
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Old April 15, 2014, 07:58 PM   #5
riverrat38
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Accurate No.9 is an easy to use powder for 357 Mag loads.
I also use A#5 for milder loads. Plus P and up.
I can use my non magnum small pistol primers with A#9. That simplifies things for me.

Best,
Rick
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Old April 15, 2014, 08:19 PM   #6
LE-28
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Wow, your in a real spot. I would work with the 140gr loads and the 300mp and start with the 158gr data and work up. I think it's the only choice you have.
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Old April 15, 2014, 08:44 PM   #7
Sarge
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Do yourself a favor and get some H-110 or W-296. The top listed load of W296 with a 140 grain Hornady XTP will get you 1250 fps from 4" revolvers and right up against 2000 fps, from a 16" carbine.
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Old April 16, 2014, 05:21 PM   #8
Mike / Tx
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Quote:
Accurate No.9 is an easy to use powder for 357 Mag loads.
I also use A#5 for milder loads. Plus P and up.
I can use my non magnum small pistol primers with A#9. That simplifies things for me.

Best,
Rick
I second the above, and I will also add in AA-7 as well. It will work really well with the 140gr loads. Also if you can get your hands on some 2400, or Blue Dot for the 140's only, not the light ones. A couple of other powders for the 140gr weight, HS-6 and IMR4227. Not saying they are tops, but they at least are listed with that weight XTP in my Hornady manual.

As for data, if you can find a Lyman, or Hornady, and MAYBE a Speer manual, they should all have something in the 140gr range you could use for data. The Speer or Lyman might be a 146 jacketed, but it will work. Just don't use cast lead data for them.
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Old April 17, 2014, 01:06 PM   #9
Martys
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300 MP

I've been experimenting with 300mp with 125 & 158gr jhp's. So far, very impressed with the results. There was a guy on the s&w forum who did an outstanding article on 300, blue dot, h110 and a few other powders. The 300 delivered the highest velocity and best accuracies hands down. My only problem is the stuff is so fine it tends to make a mess on my reloader. Might be worth while searching for that article. Don't remember the title but it was on one of the s&w forums. I may have a copy tucked away on my main computer and can have a look if your re unsuccessful. Hope this helps.
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Old April 18, 2014, 12:12 PM   #10
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OK so here is what I got so far.

Been loading the 140 grain bullets with the 300MP powder.

I have read to use standard primers (not magnum) After a little testing I have come up with a decent load that shoots pretty consistently. I am not sure how much higher I could go but this is fine. I dont need to go any higher.

140 Grain Hornady, Coonan 357 magnum 6 inch barrel. Starline Brass, Federal standard small pistol primers, Lee Factory Crimp Dye with 1/2 a turn for crimp level. (medium crimp). Charge is 19.5 Grain 300 MP powder. As always I don't recommend this to any body this is just from my gun.

I found the max charge listed for 125 grain was 22.3 and for the 158 grain is 18.6 from the Alliant reloading manual. So I doubt I am at max but I am happy with what I am at.

1523
1525
1532
1550
1529
1539
1525
1518
1547
1531

I don't know how to figure out SD but it seems pretty good. The Range from the muzzle to the chronograph is about 15 feet.

p.s. one thing is weird with this powder (maybe its just me) but the tone of the gun sounds lower than with H110 or 2400.
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Shot placement is everything! I would rather take a round of 50BMG to the foot than a 22short to the base of the skull.

all 26 of my guns are 45/70 govt, 357 mag, 22 or 12 ga... I believe in keeping it simple. Wish my wife did as well...
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Old April 18, 2014, 03:36 PM   #11
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I haven't done SD by hand in a long time, but those sure look like good results. Less than 40 FPS ES is more than acceptable.
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Old April 19, 2014, 03:39 PM   #12
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Why this thread?
When you posted in THIS thread: http://www.thefiringline.com/forums/...d.php?t=466534

This thread is the entire subject of that thread.

Do it for the Coonan people!
Coonan built, Coonan tested, Coonan chronographed loads in the thread specifically for handloading the Coonan.

I thought it was a good idea.
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Old April 19, 2014, 09:50 PM   #13
Deja vu
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OK. But I dont shoot it just in my Coonan I also tried it in my Jframe and my Marlin.

Any way 300MP is a fun powder!
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Shot placement is everything! I would rather take a round of 50BMG to the foot than a 22short to the base of the skull.

all 26 of my guns are 45/70 govt, 357 mag, 22 or 12 ga... I believe in keeping it simple. Wish my wife did as well...
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Old April 20, 2014, 12:31 AM   #14
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in this thread from 1991, an acquaintance of mine, who then worked as a mechanical engineer at JPL, explains what drives the maximum 357 mag load.

It is sticky extraction. But when cylinder walls got thinner, they were stretchier, cases got stuck. So the official 357 mag loads were reduced.

How am I getting so much more pressure to work in the 9mm and 380?
They have extractors that put over 100 pounds of force on the case and drag it out. Where as your finger tip on extraction 6 cases at once from a 357 mag cylinder can only deliver an ounce of force.

https://groups.google.com/forum/?hl=...0/cBSU4bR2jz8J
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Old April 20, 2014, 03:49 AM   #15
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Here's a Handloader Magazine article on 300MP, with some data:

http://ps-2.kev009.com/ohlandl/310/3...4_Oct_2011.pdf
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Old April 20, 2014, 11:59 AM   #16
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I've been using pp300mp for my 30 carbine loads and it works great. It's very similar to H110/w296, but it's supposedly a little slower. You could probably use H110 load data as long as you use a starting load and work your way up you should be alright.
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