Scorched .32 cases

bearcatter · 05-09-2018, 04:46 PM

This sorta fits for reloading. I noticed in all the fired cases I saved from my Guardian .32, the first third of the case looks scorched. Under the soot, the brass is discolored and dull. Is this normal? I don't see it on most other cases that litter the range.

Maybe it's because the .32 ACP headspaces on the rim, instead of the bullet? I haven't had a centerfire semi-auto in years, so don't remember what that did. It was a S&W 39, 9mm.

Also curious if that would be a concern for reloaders wanting to reuse it.

Terry_P · 05-10-2018, 04:58 AM

In reloading if you show carbon blowback it's because the powder charge (pressure) is too low to seal the brass against the chamber. It sounds like it was happening on more than one brand of ammo?? Conversely in a new handgun the chamber may be oversized. I have seen some stuff on the web on that pistol that say use Fiocchi Ammo. but don't know if they were a Fiocchi rep or not. If you can find some then give it a try otherwise I would call the 800# for NAA and ship it back.

tx gun runner · 05-10-2018, 01:16 PM

Quote:

Originally Posted by Terry_P

In reloading if you show carbon blowback it's because the powder charge (pressure) is too low to seal the brass against the chamber. It sounds like it was happening on more than one brand of ammo?? Conversely in a new handgun the chamber may be oversized. I have seen some stuff on the web on that pistol that say use Fiocchi Ammo. but don't know if they were a Fiocchi rep or not. If you can find some then give it a try otherwise I would call the 800# for NAA and ship it back.

+1 .................. I agree 100% ...Mic the barrel to see if it is a 32 or stick the bullet in the front ..

bearcatter · 05-10-2018, 03:30 PM

I've looked online, and seems mine are no problem, since it buffs off with a rag. I'm on the NAA forum now, and haven't had any negative comments.

The rim headspacing is different than spacing on the case mouth, and slightly short cases on .32 ACP are common, to ensure it spaces on the rim. The millisecond it takes to extract is enough to soot up the brass and stain it. I dug out some old .22LR cases, and my 10/22 does about the same.

I've learned a lot about my .32, and the 38 Super, that also headspaces on the rim. They're a little different animal.

moakes58 · 05-11-2018, 05:07 AM

Quote:

Originally Posted by Terry_P

In reloading if you show carbon blowback it's because the powder charge (pressure) is too low to seal the brass against the chamber. It sounds like it was happening on more than one brand of ammo?? Conversely in a new handgun the chamber may be oversized. I have seen some stuff on the web on that pistol that say use Fiocchi Ammo. but don't know if they were a Fiocchi rep or not. If you can find some then give it a try otherwise I would call the 800# for NAA and ship it back.

+1!

bearcatter · 05-11-2018, 05:46 PM

I almost forgot that NAA does like Ruger and includes testfire brass with a gun. (They shoot a full mag through each gun.) I got it out, and it matched what I fired, except it was Winchester brass. I gave up and emailed NAA with that point and my description.

Basic reply was that it is fine, perfectly acceptable. Not exactly detailed, but settles the question.

billt · 05-17-2018, 04:25 AM

Also remember the .32 ACP NAA Guardian is a VERY short barreled pistol. The powder gasses don't get much time to develop pressure before the bullet exits the barrel. This is very common with many short barreled pocket auto pistols.

The only exception is many .25 Auto models. The .25 ACP ammo has very fast burning powder loaded into it because it is only fired in short barreled pocket pistols like the Baby Browning and the like. The .32 ACP is also used in many target pistols with longer barrels. So it uses a slower burning propellant that isn't fully consumed in the NAA Guardian barrel. The result is it doesn't build up sufficient chamber pressure to seal off. Powder gas blow by is the result.

gemihur · 06-02-2018, 08:44 AM

I've experienced the blackened brass by carbon blow-by when working up loads in my 45-70 using Trail Boss.
Sometimes ya' just gotta suffer a little to get a good gas seal.
I found IMR 4198 to offer more suitable standards of ignition.
Trail Boss has it's place, recently got great results with it in the 30 Herrett... like a rimmed blackout!

05-09-2018, 04:46 PM	#1
bearcatter Senior Member Joined: Aug 2015 From: Virginia Posts: 3,863	Scorched .32 cases This sorta fits for reloading. I noticed in all the fired cases I saved from my Guardian .32, the first third of the case looks scorched. Under the soot, the brass is discolored and dull. Is this normal? I don't see it on most other cases that litter the range. Maybe it's because the .32 ACP headspaces on the rim, instead of the bullet? I haven't had a centerfire semi-auto in years, so don't remember what that did. It was a S&W 39, 9mm. Also curious if that would be a concern for reloaders wanting to reuse it.

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05-10-2018, 04:58 AM	#2
Terry_P Super Moderator Joined: Apr 2008 From: Where it's warm Posts: 10,369	In reloading if you show carbon blowback it's because the powder charge (pressure) is too low to seal the brass against the chamber. It sounds like it was happening on more than one brand of ammo?? Conversely in a new handgun the chamber may be oversized. I have seen some stuff on the web on that pistol that say use Fiocchi Ammo. but don't know if they were a Fiocchi rep or not. If you can find some then give it a try otherwise I would call the 800# for NAA and ship it back.

05-10-2018, 03:30 PM	#4
bearcatter Senior Member Joined: Aug 2015 From: Virginia Posts: 3,863	I've looked online, and seems mine are no problem, since it buffs off with a rag. I'm on the NAA forum now, and haven't had any negative comments. The rim headspacing is different than spacing on the case mouth, and slightly short cases on .32 ACP are common, to ensure it spaces on the rim. The millisecond it takes to extract is enough to soot up the brass and stain it. I dug out some old .22LR cases, and my 10/22 does about the same. I've learned a lot about my .32, and the 38 Super, that also headspaces on the rim. They're a little different animal.

05-11-2018, 05:46 PM	#6
bearcatter Senior Member Joined: Aug 2015 From: Virginia Posts: 3,863	I almost forgot that NAA does like Ruger and includes testfire brass with a gun. (They shoot a full mag through each gun.) I got it out, and it matched what I fired, except it was Winchester brass. I gave up and emailed NAA with that point and my description. Basic reply was that it is fine, perfectly acceptable. Not exactly detailed, but settles the question.

05-17-2018, 04:25 AM	#7
billt Senior Member Joined: Jul 2016 From: Glendale, Arizona Posts: 193	Also remember the .32 ACP NAA Guardian is a VERY short barreled pistol. The powder gasses don't get much time to develop pressure before the bullet exits the barrel. This is very common with many short barreled pocket auto pistols. The only exception is many .25 Auto models. The .25 ACP ammo has very fast burning powder loaded into it because it is only fired in short barreled pocket pistols like the Baby Browning and the like. The .32 ACP is also used in many target pistols with longer barrels. So it uses a slower burning propellant that isn't fully consumed in the NAA Guardian barrel. The result is it doesn't build up sufficient chamber pressure to seal off. Powder gas blow by is the result.