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SJC Open 9x19 Major Gun Load Development


HoMiE

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Got to the range for a little practice and chrono'd some loads before I began. Shot at the Prado Pistol Range (~800 ft. elev.) and it was in the mid-70's today.

twice-fired mixed brass, WSF 6.7 gr., OAL ~1.145 (10 shot string, practice ammo)

HI 1348.0 fps

LO 1285.1 fps

SD 20.6 fps

ES 62.9 fps

AVG 1320.7 fps

PF 164

once-fired mixed brass, N340 6.8 gr., OAL ~1.145 (5 shot string, match ammo)

HI 1397.8 fps

LO 1360.8 fps

SD 13.1 fps

ES 36.9 fps

AVG 1379.0 fps

PF 171

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  • 3 months later...
  • 4 weeks later...

OK, so SR-4756 didn't work to make major. So I decided to try some minor loads with it in my open glock.

MG 124's, once-fired Speer brass, WSF 4.8 gr., OAL ~1.145 (this is my production minor load to make sure chrono was working, 10-shot strings)

HI 1089.9 fps

LO 1055.0 fps

SD 13.0 fps

ES 34.9 fps

AVG 1069.3 fps

PF 132.6

I loaded up all the 4756 loads with MG 121 IFP bullets, once-fired Speer brass, OAL~1.145"

SR-4756 6.0 gr.

HI 1113.8 fps

LO 1081.8 fps

SD 12.0 fps

ES 32.0 fps

AVG 1099.0 fps

PF 133.0

SR-4756 6.3 gr.

HI 1185.7 fps

LO 1141.4 fps

SD 16.1 fps

ES 44.4 fps

AVG 1154.8 fps

PF 139.7

SR-4756 6.6 gr.

HI 1216.2 fps

LO 1197.4 fps

SD 8.1 fps

ES 18.8 fps

AVG 1206.8 fps

PF 146.0

Dot barely moved with the SR-4756 6.0 grain load. Less dot movement that the WSF minor load. Started to get snappier for me anyways as I worked up with 4756. I think I am going to run 6.0gr. for minor loads. Gun ran fine with 10# recoil spring, no FTFs or FTEs

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I run silhouette in my 38super open guns. I load montana gold 124gr JHPs to 173pf using small rifle primers and see zero pressure signs or unburnt powder. I have been loading super for 3+ years now and have loaded silhouette, HS6, IMR7625, N350, and 3N38. Seems to me that the silhouette is the best choice for pricing, availability, and performance. Bump the load a bit and it should run fairly clean.

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  • 1 month later...

Loaded up MG 121 IFP's, once-fired Speer brass, WSF 7.1 gr., OAL ~1.150". First shot was the lowest, if you throw that one out the SD and ES go down and AVG up, but just included it in the 10-shot string. (46 degress F, 4300' elev., 83% humidity)

HI 1401.3 fps

LO 1355.7 fps

SD 13.7 fps

ES 45.6 fps

AVG 1383.8 fps

PF 168.2

Edited by HoMiE
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Loaded up MG 121 IFP's, once-fired Speer brass, WSF 7.1 gr., OAL ~1.150". First shot was the lowest, if you throw that one out the SD and ES go down and AVG up, but just included it in the 10-shot string.

HI 1401.3 fps

LO 1355.7 fps

SD 13.7 fps

ES 45.6 fps

AVG 1383.8 fps

PF 168.2

Now that you have tried both 7.1 of WSF and 6.9 of N340 with about the same results... which do you like better?

I run between 6.9 and 7.2 of WSF depending on the time of year.

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Loaded up MG 121 IFP's, once-fired Speer brass, WSF 7.1 gr., OAL ~1.150". First shot was the lowest, if you throw that one out the SD and ES go down and AVG up, but just included it in the 10-shot string.

HI 1401.3 fps

LO 1355.7 fps

SD 13.7 fps

ES 45.6 fps

AVG 1383.8 fps

PF 168.2

Now that you have tried both 7.1 of WSF and 6.9 of N340 with about the same results... which do you like better?

I run between 6.9 and 7.2 of WSF depending on the time of year.

N340 is cleaner, but WSF feels softer on my hands, not as snappy as N340. N340 seems to flatten the primers more than WSF also. I am sticking with WSF, easier to get, cheaper, and I can get 8lbs jugs of it.

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I had a typo in the above post, the WSF load was 6.8, not 7.8.

Also, wanted to report that the Silhoutte load that I was shooting is leaving unburnt powder in my chamber and at the comp. I am not going to shoot silhoutte anymore and will just stick with WSF.

This is not the first comment I have seen on residues with Silhouette. I am shooting it now at 7.8gr to make a 170PF in 9mm and, atleast with my gun, I don't have any signs of residue buildup in the gun. Maybe the configuration of my gun has something to do with the lack of residue. The powder is very nice to laod with, the higher density keeps the cases ~3.4 full which works better with my 550 (less spillage). The powder also exhibits some of the most consistent, low standard deviation numbers, even with mixed, once-fired cases. I usually get an SD between 5-8 with this powder

post-12164-1212271288.jpg

post-12164-1212271319.jpg

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  • 9 months later...

Homie, just realized that this thread is almost a year old, but just wanted to give a big thanks for your load data. You sure saved me the trouble of figuring out my first SJC gun major and 9mm load. The MG 121 IFPs, WSF (I use 7.0gr), and OAL has nice recoil management, PF, and doesn't have powder overflow problems.

As a side note, I was surprised by just how little space there is available for my powder and bullets when loading 9mm...let's just say that my first few attempts loading on my recently purchased 550 involved powder spilling all over the place :wacko:.

Loaded up MG 121 IFP's, once-fired Speer brass, WSF 7.1 gr., OAL ~1.150". First shot was the lowest, if you throw that one out the SD and ES go down and AVG up, but just included it in the 10-shot string. (46 degress F, 4300' elev., 83% humidity)

HI 1401.3 fps

LO 1355.7 fps

SD 13.7 fps

ES 45.6 fps

AVG 1383.8 fps

PF 168.2

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Homie, just realized that this thread is almost a year old, but just wanted to give a big thanks for your load data. You sure saved me the trouble of figuring out my first SJC gun major and 9mm load. The MG 121 IFPs, WSF (I use 7.0gr), and OAL has nice recoil management, PF, and doesn't have powder overflow problems.

As a side note, I was surprised by just how little space there is available for my powder and bullets when loading 9mm...let's just say that my first few attempts loading on my recently purchased 550 involved powder spilling all over the place :wacko:.

No problem, glad it's working out for you. Looks like your rocking the open glock pretty well.

BTW, I don't run an oversized mag release on my SJC, just the 34 extended version. ;)

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  • 4 months later...

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