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Accurate Handloads for .357 GP100 that May Be Suitable for Hunting Medium Size Game

This is a discussion on Accurate Handloads for .357 GP100 that May Be Suitable for Hunting Medium Size Game within the Reloading forums, part of the Firearm Forum category; David Russo I Thank You for Your service !!!! If ya gonna push the 357 to upper limits with jacketed bullets there`s only 1 powder ...


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Old January 23rd, 2011, 04:58 AM   #16
 
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David Russo

I Thank You for Your service !!!!

If ya gonna push the 357 to upper limits with jacketed bullets there`s only 1 powder Hodgdons H-110/WW296 !!

2400 is a bit less volatile & shines as a cast boolit powder !!

I went back & went thru some silly wets notes & I settled on Sierras 158gr SPJ & H-110 , it shot the set with no adjustments to the sites , just a little drop of the rear notch below flush.



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Old January 23rd, 2011, 07:51 AM   #17
 
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Quote:
Originally Posted by GP100man View Post
David Russo

I Thank You for Your service !!!!

If ya gonna push the 357 to upper limits with jacketed bullets there`s only 1 powder Hodgdons H-110/WW296 !!

2400 is a bit less volatile & shines as a cast boolit powder !!

I went back & went thru some silly wets notes & I settled on Sierras 158gr SPJ & H-110 , it shot the set with no adjustments to the sites , just a little drop of the rear notch below flush.
Thanks, I think I will try H110. I can know I can get this.
They have formulas for 125 grain, 158 grain, and 180 grain bullet.
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Old January 25th, 2011, 10:04 AM   #18
 
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I'm guessing that the ignition temperature sensitivity and load sensitivity of H-110 and WIN 296 aren't going to lend themselves to the accuracy and consistency I desire in the winter, but I don't really know. The last two times I went to the range it was below 0 degrees F, although I did not test those powders at that temperature. I haven't done any more serious testing, or any testing with 140G bullets, as I am waiting to have enough stuff to put in an order for more bullets. I did get a big batch of 158 Magnus JHP to practice with, as they were very inexpensive from Gunbroker. I'm practicing at 100M now before I get back to load testing. Thos bullets seem almost as good as Sierra at 25 and 50M, and they may very well be as good but the cold is affecting my shooting and probably the ballistics. Since I'm relatively new to high-power handgun shooting, I'm not really sure when its me or the bullet thats deviating, even from a rest. I did notice that when shooting into the sun, I get fuzzy images from the top of the factory sights, like a reflection. Might be the cold has something to do with it. I'm pretty sure its not my eyes so I think I've got to do some research and correct that, I don't remember having that problem to such a degree on my .22 pistols.
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Old February 23rd, 2011, 05:02 PM   #19
 
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140G Sierra

I got great results with 140G Sierra and AA7 powder at all charges up to the limit of 13.2g published in my Sierra book. All groups were under one inch at 25M and less than three at 50M. I'm pretty sure I'm not shooting as well as the gun. 2400 withthe same bullet produced slightly larger groups, 1.5 at 25M and less than 4" at 50M. According to the Sierra book, their test gun had similar performance with the 140G bullets with all the powders, W296 being only 50 FPS faster than 2400 or AA7 at max pressure. So I think I'll load those for now until I get better with the gun. What I'm really concerned with is 100M accuracy and I've got to practice more at that. With open sights I'm shooting an 8" group off a sandbag which is worse than I've done with other handguns. But, all the handguns I've ever shot were less powerful autoloaders.
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Old February 26th, 2011, 08:25 AM   #20
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I stick with W296,Hdy xtp FP's ,win brass and wspm primers.I have been using this combo for awhile and it performs well.I use data fom the Hodgdon manual for it.
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Old February 26th, 2011, 10:05 AM   #21
 
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I don't know about hunting with it, but for targer practice, I've loaded at least 1000 38 spl rounds and all have fired using 4.0 g Bullseye and a 125g plated Berrys bullet. Typical OAL 1.470in.

For my 357s, I've used 6.2g of HP38 under a 158g HP/XTP bullet. Typical OAL 1.572-1.575in.

The picture of my GP and the target to the left is at 25 ft using my 38s.
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Old February 26th, 2011, 03:22 PM   #22
 
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If you are going with lead boolits you might want to check your cylinder throats. MY GP-100 had throats so tight a .357 bullet would not pass through them and a .356 would only do so with substantial effort. I reamed all six throats out to .358 and will have to cut the forcing cone to 11 degrees. Throats as tight as .357 are not going to be condusive to accuracy using lead boolits.

Do you really think expecting 3" groups at 100 meters is doable or are you running a scope on your revolver?

Take Care

Bob
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Old September 24th, 2019, 11:20 AM   #23
 
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Post hunting loads for GP 100 .357MAG. 6" barrel

Hello everyone! I have a GP 100 coming in 2 days. I reload exclusively. I am searching for a good accurate hunting load for the 6" barrel. 357 magnum. I normally shoot 158gr. S.J.H.P. over 7.5gr. WW231 which works well out of my 4" 357. I also use 125gr. S.J.H.P. over 9.2gr. of UNIQUE.

Has anyone found a sweet, accurate load for the 6" GP 100 .357???
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Old September 25th, 2019, 09:49 AM   #24
 
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For hunting loads, you are going to want accuracy and terminal performance. There are many combinations that give that. Light bullets typically isn't going to be what you want here, limited penetration. As far as powders, many swear by H110, 2400, W296. Alliant gives another option with MP 300 that is about as slow are you can get for the 357, it likes to be loaded past some of the bullet manufacturer max loads. I put a thread on here recently about what I found with it using XTP bullets, so I won't go into that, its on here if you want to look it over. You may sacrifice a little accuracy looking for max power, I would try different max loads with different powders and see which balances the best in your revolver.
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Old September 26th, 2019, 01:14 AM   #25
 
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My most accurate load is any jacketed 140 grain bullet with 9.0 grains of Power Pistol. Federal primers and a Lee FCD in the cannelure. Clover leafs in my 6" and 4.2" barreled GP100's at 25 yards, and still tight at 50 yds. YMMV.
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Old October 30th, 2019, 01:22 PM   #26
 
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Quote:
Originally Posted by DAVID RUSSO View Post
I haven't had good results with 125G so far. I've tried AA7, WIN296, and 2400. All three got at best 4" groups at 50M, and only at the maximum loads listed in my Sierra book (I'm using Sierra 125 and 158 JSP) but the cases were sticky and this wasn't the accuracy I was looking for. In addition, with the 125G, I was shocked at the 'wind' bewteen 25 and 50 meters. If the group was 2" left of center at 25 meters, it was 6" at 50 meters, with no apparent change in elevation. Is this normal?
I've had better results with 158G bullets on all three powders but only slightly better than the 125G, except, with a 158 JSP on 14.5G of 2400 gave 1" groups at 25M and 2" groups at 50 meters. I wouldn't be surprised, except that at 14.0 and 15.0 of the same powder, the groups were about 4" at 50M.

Has anyone encountered this? Are revolvers really this sensitive to propellant? I was shooting 3 round groups at 25M and 7 round groups at 50M with open sights, from a rest, same as all my loads. I don't think I've seen such an extreme sensitivity with rifles before.

Its a relatively new 6" GP100 and I've shot about 300 rounds through it. I've only done sight work on it (to eliminate that annoying free play in windage, doesn't anyone fit anything by hand anymore?).
On that 158 grain J.S.P. with 14.5 grains of 2400 what primer did you use? A standard small pistol primer or a magnum small pistol primer?????
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Old October 30th, 2019, 04:55 PM   #27
 
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You do realize this old thread goes back to 2011. And David has only posted 10 times during or at that time . Maybe he is still out there! As for me, I always use a regular primer with any 2400 load as it is easy to ignite.
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