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Old February 13th, 2018, 09:31 AM #1
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Question .357 Dia 9mm Overpressure

Question for those with a lot more reloading experience than me.

I recently acquired a box of XTreme Bullets 9mm 147gr RN with a diameter of .357 during one of their sales. Using the Alliant Manual I put 4.0 grains of Unique in the case. I use the same load for my 147gr HP and 147gr RN both have a diameter of .355.

Yesterday when I was shooting at TMGN I observed signs of over pressure in the cases that were loaded with the .357 bullets. I could see the firing pin strike and a small rectangular dent around it (I'm using a Gen 3 G17). I know I will have to back off the load for safety reasons but my question to the group is:

With all things being equal why do I have over pressure with the .357 and not the others?

Google has not yielded results that satisfy my curiosity. Most answers direct me towards information about 9mm +P.
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Old February 13th, 2018, 09:38 AM #2
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You put a copper plated bullet that is .002 over sized into a 9mm?
I think you have the answer there.

Ruger makes a convertable pistol that is 357 and accepts 9mm. But the bore is designed for the bigger 357 bullet so 9mm will shoot but will shoot like an undersized bullet.
Going the other way around is a whole other story I think.
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Old February 13th, 2018, 09:48 AM #3
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Quote:
Originally Posted by Melnic View Post
You put a copper plated bullet that is .002 over sized into a 9mm?
I think you have the answer there.

Ruger makes a convertable pistol that is 357 and accepts 9mm. But the bore is designed for the bigger 357 bullet so 9mm will shoot but will shoot like an undersized bullet.
Going the other way around is a whole other story I think.
Thanks,

I guess it's a case of let the buyer beware.

Though I wonder who would use .357 I guess someone shooting competition.
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Now since man is naturally inclined to avoid pain and since labor is pain in itself it follows that men will resort to plunder whenever plunder is easier than work. History shows this quite clearly. And under these conditions, neither religion nor morality can stop it.

When, then, does plunder stop? It stops when it becomes more painful and more dangerous than labor.

-Frederic Bastiat
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Old February 13th, 2018, 05:11 PM #4
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Picture of the primer(s)?

Both of my Gen 3 .357 SIGS (31 & 32) will leave a rectangular 'box' around the pin strike, with factory Speer ammo. If the primer still has a radius to the edge, you may be seeing a little bit of flow back into the opening of the slide for the striker.

I'll see if I can snag a pic of my brass, so you can see if it's identical to yours.

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**FWIW, I've had plenty of plated bullets for .45ACP (ideally .451") that measured in from .452" to as much as .453.5", they weren't an issue as long as I didn't try to push them at a max charge. A quick look around, 4gr of Unique is still safely under a max charge.
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Old February 13th, 2018, 05:50 PM #5
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I've been reading that the wider 0.356-0.357 bullets are meant for older European barrels that tend to have wider bores. Stick with the 0.354-0.355 bullets.

http://www.gunrightsmedia.com/showth...or-9mm-and-357
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Old February 13th, 2018, 09:31 PM #6
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My primer has the same appearance though the dent is a little deeper. I assumed there was an issue because the .355 loads had a simple round strike mark.
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Now since man is naturally inclined to avoid pain and since labor is pain in itself it follows that men will resort to plunder whenever plunder is easier than work. History shows this quite clearly. And under these conditions, neither religion nor morality can stop it.

When, then, does plunder stop? It stops when it becomes more painful and more dangerous than labor.

-Frederic Bastiat
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Old February 14th, 2018, 05:54 AM #7
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As already said, the extra .002" is simply the plating. This is normal as they take a normal .355" bullet and plate it. Always back off your load and start over when changing bullets. Also, if possible, find data for the bullet you are using. I also have xtreme bullets that are slightly oversize for my 45 ACP. They shoot great but I had to back off more than usual because of the plating.
If I may, what is your load?
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Old February 14th, 2018, 07:05 AM #8
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Quote:
Originally Posted by Seabee View Post
As already said, the extra .002" is simply the plating. This is normal as they take a normal .355" bullet and plate it. Always back off your load and start over when changing bullets. Also, if possible, find data for the bullet you are using. I also have xtreme bullets that are slightly oversize for my 45 ACP. They shoot great but I had to back off more than usual because of the plating.
If I may, what is your load?
Maybe so with other bullet makers, but not necessarily true with Xtreme Bullets. They offer several different diameters in the same caliber and same weight so it would be wise to read what you are ordering.

https://www.xtremebullets.com/9mm-s/9666.htm
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Old February 14th, 2018, 10:30 AM #9
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Quote:
Originally Posted by Seabee View Post
As already said, the extra .002" is simply the plating. This is normal as they take a normal .355" bullet and plate it. Always back off your load and start over when changing bullets. Also, if possible, find data for the bullet you are using. I also have xtreme bullets that are slightly oversize for my 45 ACP. They shoot great but I had to back off more than usual because of the plating.
If I may, what is your load?


147gr bullet
4.0 gr Unique
CCI 500 primer
Once fired brass
COAL is factory standard


Sent from my iPhone using Tapatalk
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Now since man is naturally inclined to avoid pain and since labor is pain in itself it follows that men will resort to plunder whenever plunder is easier than work. History shows this quite clearly. And under these conditions, neither religion nor morality can stop it.

When, then, does plunder stop? It stops when it becomes more painful and more dangerous than labor.

-Frederic Bastiat
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Old February 14th, 2018, 10:39 AM #10
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I normally run cast bullets that are 1 - 2 thousandths over the nominal bore size.

NOT with jacketed.
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