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Got out the Auto Mags today

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TC357MAX View Drop Down
International Auto Mag
International Auto Mag


Joined: 10 Mar 2008
Location: Weyers Cave, VA
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TC357MAX Quote  Post ReplyReply Direct Link To This Post Topic: Got out the Auto Mags today
    Posted: 01 Jun 2008 at 2:16am
Well had a chance to try some new loads with my auto mag. My 44 auto mag never has shot well with my reloads. Last thing I tried was a different bullet, I ordered some 240 gr Sierra HP with a semi-jacket. Both corbon and OWS shoot fine in my pistol. Originally I started with 23.0 gr of W296 they jammed. I worked up to 25.0 gr and still jamming.  Today I started over, I reduced the load to 21.0 grains and only the first 2 in the clip jammed. I reduced load to 20.5 gr and pistol shoots fine.  Good for target load, but not as hot for hunting.  I averaged 1266 fps.

With the 357 AMP I worked up to 21 gr of W296 at 1613 fps.  Seems like the 357 is going to be more reliable for hunting, feeds every time.

I am glad to finally get both shooting with my reloads!


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usrguns View Drop Down
Callahan's Auto Mag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote usrguns Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 2008 at 2:21am
Can't give you the data right now cuz I'm at work, but when I get home I will post a load that has been working great for me. I do know it uses Lil Gun and it's about 1400fps.  Will post it as soon as I get home!!!!!!!!!!!!!
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Callahan's Auto Mag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote usrguns Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 2008 at 6:25am
Carl. Here is the load I was talking about.   
240 gr Hornady XTP
22.1 gr LiL'Gun
Starline Brass
Win LP
Case length 1.295
OAL: 1.605
Muzzle Vel: 1400 fps
I don't know if this will work for you, but my 44 Loves these.      
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Ginsaw View Drop Down
Callahan's Auto Mag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ginsaw Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 2008 at 7:00pm
TC, what weight and kind of bullet were you using in the .357 to go with the 1613 fps?
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TC357MAX View Drop Down
International Auto Mag
International Auto Mag


Joined: 10 Mar 2008
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TC357MAX Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2008 at 1:21am
Thanks Larry, I will try to get some Lil' Gun and give it a try.

Ginsaw-  I loaded Hornady XTP 158gr for the 357 AMP.


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Ginsaw View Drop Down
Callahan's Auto Mag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ginsaw Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2008 at 2:51am
I know you probably won't have the answer to this, but do you have any idea as to the ft lbs of that 357 load?
 
I've been thinking of bringing it up in another thread, but I'm interested in learning what formula there is for figuring energy levels generally. You know, crank in the bullet weight and type and fps, and you get the ft lbs. There's got to be such a formula. With 44 many of us can estimate it somewhat, but something more scientific would be good to know. Personally I like about 1K, but not much more, for deer and that's one place it could be useful.
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Gerry View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerry Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2008 at 1:01am
Ginsaw
All Reloading manuals have tables to calculate the ft lbs of energy of a given load.
If your want a good Father's Day present, ask for "Understanding Ballistics" by Robert A. Rinker. It gives an easy understanding of what happens everytime you pull a trigger.
 
Gerry
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TC357MAX View Drop Down
International Auto Mag
International Auto Mag


Joined: 10 Mar 2008
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TC357MAX Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2008 at 3:02am
158 gr bullet @ 1613 = about 913 ft/lbs.  Not far from 1,000

E = (bullet weight X velocity squared) all divided by  450,400

that give a pretty close number.

 
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Ginsaw View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ginsaw Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2008 at 4:50am

I tried playing around a little with the formula and it appears the first thing I need is to find a calculator that goes that high.

Up til now I've been going by a rough estimate to the effect that a change in fps seems in many cases to equal a similar amount of change in ft lbs. For instance, in 44 factory ammo there's about 100 fps difference between several brands and a not far off difference in ft lbs also.
 
I don't have many 357 figures to compare it to, but -
 
Buffalo Bore 357 158 @ 1475 = 763 ft lbs
Federal 357 158 gr @ 1240 fps = 539 ft lbs  
Winchester 357 158 gr @ 1235 fps = 535 ft lbs 
 
Same pattern as with the 44. The difference between the Buffalo Bore and the next two is about the same for fps and ft lbs. I'm probably missing some reason why this theory of estimating ft lbs wouldn't always pan out. Anyone see what it would be?
 
Gerry, I'm not a reloader so I probably won't get into those manuals. But the book does sound good and I'll look into it.
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Gerry View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerry Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2008 at 12:21am
I think I got my copy from Midway. Interesting stuff.
 
Gerry
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