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Discussion Starter #1
I am hoping someone can run this load in their ballistic software and see what pressure it shows, hint hint Iowegan:D From what data I have it is under max but with the velocity I am getting is more than expected.

Hornady .357 XTP 140 grains 0.157SD
Federal 100 small pistol magnum primers
13 grains 2400
1.590 OAL
Temp 75deg F

I worked up to these and they show no sign of over pressure, it's sometimes hard to tell with 357mag though. I ran these over the crono and I am getting 1313 FPS avg from my 2-1/4 SP101. I ran some other loads I have cronoed before just to make sure it was not malfunctioning.
 

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REB, If you use a standard small pistol primer, 13 gr of 2400 should run about 1200 fps in a 6" revolver or only 790 fps in a 2.25" barrel. My data says you should NOT use magnum primers with 2400 because the chamber pressure elevates too fast. With a regular primer it takes about 15 gr to hit 1300 fps in a 6" barrel so that primer is probably the culprit.

Here's the pressure with a 140 gr bullet and 2400 according to QuickLOAD: 13 gr = 24430 psi, 14 gr = 29581 psi, 15 gr = 35022 psi. These pressures assume a standard primer but unfortunately, the software does not allow you to plug in a magnum primer. No doubt, the pressure will be quite a bit higher. 35,000 psi is the SAAMI max chamber pressure for a 357 Mag.
 

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Discussion Starter #3
Out of curiosity what data is that based on. Everything I have list magnum primers with 2400 in the 357mag. I have always used standard primers with 2400 for 44mag.

By the way that is a typo in my first post as Federal small pistol magnum primers are #200 not #100
 

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REB, Here's the actual data in the Speer #13:

140 gr JHP, 1.590" COL, CCI 500 primers (standard), 6" Mod 19 S&W

Min 13.1 gr 2400 = 1219 fps, Max 15,1 gr 1298 fps

In the Speer #13 preface (page 526) for the 357 Mag, it says:
We developed new data with Alliant 2400 propellant. Changing from magnum to standard primers significantly improved its performance. Do not use Magnum primers with the 2400 loads shown here or high pressure will result.

Edited to add: One thing for sure ... you never get something for nothing when reloading. When you get notably more velocity than what the book says for a specific load, your chamber pressure is going to be much higher.

My favorite load for the 140 gr JHPs is 18 gr of Win 296 and a CCI 550 primer (magnum). This is a tack driver load with full power potential. My actual chronograph data from a 6.5" Ruger BH averages 1386 fps with a max velocity spread of 13 fps. It burns clean but does make a huge muzzle flash.
 

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Discussion Starter #5
Thanks. I was actually impressed with the accuracy, it was very good and a spread of 12fps for 10 rounds.
 
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