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Old May 17, 2007, 09:49 PM   #1
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Picked up 158gr JSP, Win 357mag cases, and now I need a load for my GP-100

I have a new GP-100 4" on the way and I need a good solid load to use with it.

Winchester 158gr JSP bullets
Winchester 357mag cases
Winchester small pistol primers (both stand and magnum)

I have on hand A2400, W231, W296, Universal, Unique, and Titegroup.

I am looking for a nice solid performing load around 1150-1250fps from my pistol.

I am leaning towards using Universal or titegroup, as they are pretty clean. Although, W231 has been pretty clean in the past as well.

These are primarily self defense PRACTICE loads I am going for.

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Old May 17, 2007, 11:07 PM   #2
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I would work with the Universal and 2400, W231 and Titegroup may have to much pressure at the 1250 fps end. I have a 4" Colt Trooper that loves AA#7 and Blue Dot, I do stay well below max with BD as it behaves erratically at cooler temps. AA#7 I load lighter as well but for accuracy reasons. I have been thinking of AA#9 when I run out of BD.

I would work with the Universal and 2400,
Sorry, I don't think Universal would be a good choice for the velocity you want, W-296 and 2400 would be your best bet.

Last edited by joneb; May 18, 2007 at 09:01 AM.
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Old May 18, 2007, 07:36 AM   #3
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I get right at 1200 fps with 2400 or 296, and 158gr jacketed bullets from my 4" GP-100. The 296 load is Winchester's listed max at 16.7gr with CCI350 primers. Couldn't find my notes on the 2400 load, but it was not over max either. Expect a visible fireball with either load.....even during the day.
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Old May 18, 2007, 07:40 AM   #4
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I have used 15gr of 2400 for years and have had no complaints. Mine is a 4" Python.
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Old May 18, 2007, 03:53 PM   #5
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I have been shooting 357 mag for close to 20 years now and of the powders you have listed , 296 has given me outstanding consistency and accuracy through a lot of guns - especially my Smith 686s , Ruger Blackhawks and a TC Single shot 357. Also works great in my 44 mag loads.

2400 mentioned by pdawg is an old standby that has been around for a lot of years. I used to use it a lot and it too can produce great results.

The bullet you have , the Win 158 JSP - I used Winchester's JHP version and a load of 15.2 of 296 with a mag primer and it was one of the most accurate loads I ever shot through a revolver.
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Old May 18, 2007, 04:45 PM   #6
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Agree on 296 or H110 for the jacketed 158's. If you are looking for plinking and practice, get some lead 158 gr SWC's and run those with about 5 grains of Universal. In a 6" tube this is just under 1000 fps, and will be more comfortable to play with and will have about the same point of impact.
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Old May 20, 2007, 09:57 AM   #7
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You mentioned Unique. 6.5 grs. of Unique under a 158 gr. jsp or jhp makes a nice plinking load that resembles the recoil from full power factory 125 gr. loads. Runs about ` 1050 fps. from 4 " bbls.
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Old May 20, 2007, 06:31 PM   #8
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