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Old 05-17-2013, 23:56   #1
PghJim
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357 Sig Faster than a 9x25 Dillon?

This is only one test. I broke out the chronograph for the first time this year and had an opportunity to test Underwood's 357 Sig 125 gr. GD out of a 4.5" G32, and Underwood's 9x25 Dillon 125 gr GD out of a 4.6" converted G20.

5-Shot average for the 357 Sig was 1,611 fps (unbelievable), and the 5-shot average of the 9x25 was 1,646 fps. Yea, I know the 9x25 was a little faster, but not by much.

But again, this is only one test with one box of ammo each and only one barrel for each.

Other news - There have been some problems with Underwoods 357 Sig ammo failure to fire. I called and Kevin said he received a batch of hard primers, and there will not be any problems with ammo going forward.
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Old 05-18-2013, 01:49   #2
Tiro Fijo
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Impressive, to say the least.
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Old 05-18-2013, 02:12   #3
cowboy1964
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4.5" g32? Aftermarket barrel or is that a typo?

Last edited by cowboy1964; 05-18-2013 at 02:13..
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Old 05-18-2013, 03:53   #4
PghJim
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4.5" g32? Aftermarket barrel or is that a typo?
It has a Lone Wolf barrel in it.
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Old 05-18-2013, 04:09   #5
BuckyP
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That's smoking velocities out of the .357. About 300+ FPS above traditional factory, no?
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Old 05-18-2013, 06:55   #6
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Those 357 Sig velocities are too hot. That ammo seems like a kaboom waiting to happen. Be careful with it!
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Old 05-18-2013, 07:53   #7
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Those 357 Sig velocities are too hot. That ammo seems like a kaboom waiting to happen. Be careful with it!
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Old 05-18-2013, 10:07   #8
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LISTEN TO THIS MAN !!

There are NO free lunches.
I have a 6" kkm 357 sig barrel. Trying to find max load using aa#9 and blue dot, I had some pretty quick speeds. the brass in the 357 sig case starts flowing forward near max loads. I only load them in new cases now. 357 sig does not reload like a good ole straight cased pistol cartridge.

The 357 sig has a sweet spot with slower burning powders up near the top end, very consistent ignition.

I like it. eidt - in the 6" barrel
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Old 05-18-2013, 10:32   #9
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I like the Speer, Remington, Federal, and Hornady .357sig rounds just the way they are. The extra velocity of the boutique ammos don't hold any attraction for me, given that for self-defense purposes the caliber unquestionably gets the job done.

On another note, some of the bullets used in boutique ammos may be driven beyond design windows, causing the bullet to significantly underperform.
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Old 05-18-2013, 12:32   #10
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Is the 9x25 a bottlenecked cartridge?
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Old 05-18-2013, 13:18   #11
PghJim
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Is the 9x25 a bottlenecked cartridge?
It is a 10mm necked down to .355.
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Old 05-18-2013, 19:00   #12
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Seems Underwood likes to play right at the edge of blowing up people's guns.
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Old 05-18-2013, 22:58   #13
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How do those 357 Sig cases look after firing, Jim?

Added: I hope this didn't come across as sarcastic. This is a serious question. Fired cases can tell you a lot. But sometimes you're way past safe pressures by the time the cases and primers show a problem, especially if you're using rifle primers.
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Old 05-19-2013, 06:50   #14
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Originally Posted by PghJim View Post
This is only one test. I broke out the chronograph for the first time this year and had an opportunity to test Underwood's 357 Sig 125 gr. GD out of a 4.5" G32, and Underwood's 9x25 Dillon 125 gr GD out of a 4.6" converted G20.

5-Shot average for the 357 Sig was 1,611 fps (unbelievable), and the 5-shot average of the 9x25 was 1,646 fps. Yea, I know the 9x25 was a little faster, but not by much.

But again, this is only one test with one box of ammo each and only one barrel for each.

Other news - There have been some problems with Underwoods 357 Sig ammo failure to fire. I called and Kevin said he received a batch of hard primers, and there will not be any problems with ammo going forward.
Hey Jim,
How are you liking that 4.49" barrel for your 32? I've wanted an extended barrel for mine and was eyeing that same one. I don't like the ones that stick out an inch and a half so I thought that one would be just right. In your opinion is the half inch extra worth the $$? Could you maybe give us/me a pic of your 32 with the barrel in? Thanks
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Old 05-19-2013, 08:15   #15
PghJim
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Hey Jim,
How are you liking that 4.49" barrel for your 32? I've wanted an extended barrel for mine and was eyeing that same one. I don't like the ones that stick out an inch and a half so I thought that one would be just right. In your opinion is the half inch extra worth the $$? Could you maybe give us/me a pic of your 32 with the barrel in? Thanks
I like it a lot. You get G31 ballistics from a G32 and there is only a half an inch sticking out. If you get a threaded barrel, I think it looks even better.
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Old 05-19-2013, 10:34   #16
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It is a 10mm necked down to .355.
Thanks.
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Old 05-19-2013, 10:47   #17
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I like it a lot. You get G31 ballistics from a G32 and there is only a half an inch sticking out. If you get a threaded barrel, I think it looks even better.
Do you think there is better chamber support in the lone wolf vs stock? For underwood ammo. I recently picked up a g20 and thought about a 357 barrel for that since I have a lot of 357 ammo, but I do prefer the g32 platform over the larger frame g20. I kinda feel like the best Long term decision is to get a .40 barrel for the g20 instead of a 357 until I can get into reloading.
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Old 05-19-2013, 18:29   #18
PghJim
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Do you think there is better chamber support in the lone wolf vs stock? For underwood ammo. I recently picked up a g20 and thought about a 357 barrel for that since I have a lot of 357 ammo, but I do prefer the g32 platform over the larger frame g20. I kinda feel like the best Long term decision is to get a .40 barrel for the g20 instead of a 357 until I can get into reloading.
There has never been any chamber support issue with the stock 357 barrels. My LWD is very accurate, but if I had to do it again I would have KKM make the barrel. If you call them, they can make a G32 barrel up to 5".
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Old 05-19-2013, 19:02   #19
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There has never been any chamber support issue with the stock 357 barrels. My LWD is very accurate, but if I had to do it again I would have KKM make the barrel. If you call them, they can make a G32 barrel up to 5".
you are right. My G17 6" is a KKM the 357 sig is a lone wolf. I thought it was the other way around.

I like the 357 sig out of the G20 for hot loads. In fact I like the g20 period.
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Old 05-19-2013, 19:16   #20
PghJim
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I like the 357 sig out of the G20 for hot loads. In fact I like the g20 period.
Rusty, I have a G29 do you know if I can get a 357 sig barrel for it? If so, would the G29 mags work? I have never checked this out so I do not even know if someone makes the barrel.
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