GP100 6" Owners 158GR XTP H110

Darien Outdoors · August 20, 2014, 05:41 PM

I just loaded my 1st 357 mags today and shot with no issues, no bulging primers, no sticky shell ejects.

I started with 9MM in my shield with 4.1gr AA2 and Plated RN 115gr and I have a set load for myself with no issues.

Then worked up to some 38 special with plated RN 158gr and 4.1gr Tightgroup and found a nice plinking load and set on them for my GP100.

NOW into the MAG loading.

Asking who has tested a load slightly higher then what I just did to see the max load before issues started with same pistol?

I will be testing myself, just looking for a stopping point. Dam books (4 that I have) all show loads all over the place. I read the H110 does no like to be downloaded and works best at max or just under.

My load as of today:

GP100 6"
158gr XTP
15.5Gr H110
OAL 1.590"
Med roll crimp
CCI SPM

I have no chrono to check speed but it felt perdy stout to me.

Thnx in advance.

DO

Nick_C_S · August 20, 2014, 05:56 PM

Quote:

158gr XTP
15.5Gr H110
OAL 1.590"
Med roll crimp
CCI SPM

. . . ^^ I have loaded that exact recipe. ^^

Here's the chrono results:

S&W 686 3" bbl: 1090 fps; 417 ft/lbs.
S&W 686 4" bbl: 1155 fps; 468 ft/lbs.
S&W 686 8.375" bbl: 1188 fps; 495 ft/lbs.

H-110 is a slow, forgiving powder. By no means am I suggesting doing anything outside published data. I'm just saying that slow powders tend to allow for some. . . wiggle room.

Brian Pfleuger · August 20, 2014, 06:10 PM

For those select powders that carry "Do Not Reduce" warnings, I think it wise to use data provided by the powder manufacturer.

Hodgdon's load for the 158gr XTP and H110 is 15.0-16.7gr. They also call for a MAGNUM primer. I would use one for this powder.

Darien Outdoors · August 20, 2014, 06:17 PM

Thanks guys.

I did use mag primers.

I didnt bench when I tested, but off hand seemed real accurate.

I will work up another 25 at 16.0gr and test that this week.

I think that will be the top end for me. Like I said seemed like a nice stout load at 15.5gr.

If all goes good I will end my 357 mag data sheet at that... with 158 XTP's and H110 at least...LOL

NEXT....LOL

DO

ligonierbill · August 20, 2014, 06:23 PM

I am loading for a 4" GP-100. I have loaded a bit more H110 in mine and exceeded 1,200 fps with no issues. Cases drop right out. However, at least in this shorter barrel, AA#9 works better. Think 1,300 with STD of 9.6. That's my go to. As always, work up slowly. FWIW, 158 Blazer JHP commercial goes 1,239 with STD of 14.6 from mine.

Mavrick79 · August 21, 2014, 07:25 AM

I've been shooting 158 grain Montana gold jhp's with 15 grains of H110 and Winchester small pistol magnum primers in my GP100 6" for a while now with no problems. Average FPS has been around 1263.

jim8115 · August 21, 2014, 11:21 AM

6" GP100
158 XTP
16.5 Gr H-110 , Winchester mag primer
very firm crimp
AVg 1331 FPS

August 20, 2014, 05:41 PM	#1
Darien Outdoors Junior Member Join Date: August 14, 2014 Posts: 10	GP100 6" Owners 158GR XTP H110 I just loaded my 1st 357 mags today and shot with no issues, no bulging primers, no sticky shell ejects. I started with 9MM in my shield with 4.1gr AA2 and Plated RN 115gr and I have a set load for myself with no issues. Then worked up to some 38 special with plated RN 158gr and 4.1gr Tightgroup and found a nice plinking load and set on them for my GP100. NOW into the MAG loading. Asking who has tested a load slightly higher then what I just did to see the max load before issues started with same pistol? I will be testing myself, just looking for a stopping point. Dam books (4 that I have) all show loads all over the place. I read the H110 does no like to be downloaded and works best at max or just under. My load as of today: GP100 6" 158gr XTP 15.5Gr H110 OAL 1.590" Med roll crimp CCI SPM I have no chrono to check speed but it felt perdy stout to me. Thnx in advance. DO

August 20, 2014, 06:10 PM	#3
Brian Pfleuger Moderator Emeritus Join Date: June 25, 2008 Location: Austin, CO Posts: 19,578	For those select powders that carry "Do Not Reduce" warnings, I think it wise to use data provided by the powder manufacturer. Hodgdon's load for the 158gr XTP and H110 is 15.0-16.7gr. They also call for a MAGNUM primer. I would use one for this powder. __________________ Nobody plans to screw up their lives... ...they just don't plan not to. -Andy Stanley

August 20, 2014, 06:17 PM	#4
Darien Outdoors Junior Member Join Date: August 14, 2014 Posts: 10	Thanks guys. I did use mag primers. I didnt bench when I tested, but off hand seemed real accurate. I will work up another 25 at 16.0gr and test that this week. I think that will be the top end for me. Like I said seemed like a nice stout load at 15.5gr. If all goes good I will end my 357 mag data sheet at that... with 158 XTP's and H110 at least...LOL NEXT....LOL DO

August 20, 2014, 06:23 PM	#5
ligonierbill Senior Member Join Date: May 20, 2007 Posts: 2,459	I am loading for a 4" GP-100. I have loaded a bit more H110 in mine and exceeded 1,200 fps with no issues. Cases drop right out. However, at least in this shorter barrel, AA#9 works better. Think 1,300 with STD of 9.6. That's my go to. As always, work up slowly. FWIW, 158 Blazer JHP commercial goes 1,239 with STD of 14.6 from mine.

August 21, 2014, 07:25 AM	#6
Mavrick79 Senior Member Join Date: August 25, 2013 Posts: 143	I've been shooting 158 grain Montana gold jhp's with 15 grains of H110 and Winchester small pistol magnum primers in my GP100 6" for a while now with no problems. Average FPS has been around 1263.

August 21, 2014, 11:21 AM	#7
jim8115 Senior Member Join Date: July 23, 2011 Location: Arkansas Posts: 229	6" GP100 158 XTP 16.5 Gr H-110 , Winchester mag primer very firm crimp AVg 1331 FPS