Pardini .32 ACP Chamber Type? Pic

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Pardini .32 ACP Chamber Type? Pic

Post by beeser on Wed Jun 17, 2015 7:07 pm

I borrowed the following image from Penn Bullets website.  Does anyone know what chamber type is used with the Pardini SPBE .32 ACP?


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Re: Pardini .32 ACP Chamber Type? Pic

Post by dronning on Wed Jun 17, 2015 8:17 pm

You could always give Cerrosafe a try

http://www.brownells.com/gunsmith-tools-supplies/barrel-tools/barrel-chamfering-accessories/cerrosafe-chamber-casting-alloy-prod384.aspx

- Dave

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Re: Pardini .32 ACP Chamber Type? Pic

Post by Axehandle on Thu Jun 18, 2015 11:33 am

You could do the old trial and error method.  Size a case and just barely start the bullet in the case mouth.  Try the cartridge in the chamber with your fingers.  So NOT drop the slide and force the bullet into the rifling.  If that happens you will need a squib rod to get the bullet out of the barrel.   Slowly seat the bullet deeper and deeper until the round drops into the chamber.

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Re: Pardini .32 ACP Chamber Type? Pic

Post by beeser on Thu Jun 18, 2015 12:39 pm

I suspect the chamber is like the one shown on top based on how a LSWC fits into the chamber.  The question is more academic than practical.  Apparently, Pardini will be coming out with a barrel more suitable for LSWC bullets.


Last edited by beeser on Fri Jun 19, 2015 8:07 am; edited 1 time in total

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Re: Pardini .32 ACP Chamber Type? Pic

Post by Wes Lorenz on Fri Jun 19, 2015 3:34 am

I designed my own and had PTG grind it. It chambers on the case mouth and has a 3 degree included angle throat. I made the chamber too big and wish I'd made it around .336-.338" ID.

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Re: Pardini .32 ACP Chamber Type? Pic

Post by fc60 on Fri Jun 19, 2015 11:32 am

Wes Lorenz wrote:I designed my own and had PTG grind it. It chambers on the case mouth and has a 3 degree included angle throat. I made the chamber too big and wish I'd made it around .336-.338" ID.
Greetings,

I have Mr. Lorenz's reamer and it was ground by JGS Precision Tool, not PTG.

Cheers,

Dave

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Re: Pardini .32 ACP Chamber Type? Pic

Post by beeser on Fri Jun 19, 2015 11:38 am

Wes Lorenz wrote:I designed my own and had PTG grind it. It chambers on the case mouth and has a 3 degree included angle throat. I made the chamber too big and wish I'd made it around .336-.338" ID.
Could you elaborate more on what you did to the chamber?

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Re: Pardini .32 ACP Chamber Type? Pic

Post by Wes Lorenz on Fri Jun 19, 2015 4:53 pm

Thanks Dave! That's a tool maker and his attention to detail. When I was researching the reamer I had talked to Larry Carter, Jerry Keefer, and Mr Kreiger who had tried things on the 32acp or other calibers. I wanted it to headspace on the case mouth which I feel is a good thing even though everyone else went with the rim. Jerry was thoughtfull and suggested the 3 degree included angle because he had good success in the .38's he builds. Mr. Kreiger suggested the .311 x 10" twist barrel. If I remember correctly it is short throated, but Dave has the drawing. If I could do it again I'd follow Dave's advise and spec a smaller chamber ID.
I can get 2 1/2" groups at 50 and pinwheel the 25, so I'm very happy. My 1911 has the same accuracy level and it has made the 2650 club.
Hope this helps,
Wes

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Re: Pardini .32 ACP Chamber Type? Pic

Post by Dr.Don on Fri Jun 19, 2015 10:09 pm

I'm confused.  I have never owned anything in .32 ACP.  I thought it was a rimless cartridge.  Is it semi-rimmed like the .38 Super?  Or what am I missing here?

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Re: Pardini .32 ACP Chamber Type? Pic

Post by beeser on Fri Jun 19, 2015 11:17 pm

Dr.Don wrote:I'm confused.  I have never owned anything in .32 ACP.  I thought it was a rimless cartridge.  Is it semi-rimmed like the .38 Super?  Or what am I missing here?
It's semi-rimmed.

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Re: Pardini .32 ACP Chamber Type? Pic

Post by dronning on Fri Jun 19, 2015 11:34 pm

From Wikimedia


- Dave

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Re: Pardini .32 ACP Chamber Type? Pic

Post by Dr.Don on Sat Jun 20, 2015 10:00 am

OK, thanks guys.  The .38 Super guys learned loooong ago that cartridge will not reliably headspace on that tiny rim extension.  It needs to headspace on the cartridge mouth.  I would expect the same with .32 ACP.  Don't know what the Pardini chambers are like.

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Re: Pardini .32 ACP Chamber Type? Pic

Post by fc60 on Sat Jun 20, 2015 12:19 pm

Greetings All,

The 38 Super is a locked breech, recoiling barrel system.

The Pardini 32 ACP is a blow back system.

True, the 32 ACP SAAMI drawings list the cartridge as a rimmed design.

Pardini decided to go with a non SAAMI design in which the cartridge head spaces on the mouth.

Also, the original Pardini plan was to use the Hornady 60 grain XTP bullet and the chamber reams were cut for that bullet of 0.311" diameter. Test groups with this bullet are very close to ten-x at 50 yards with carefully loaded ammunition.

Cheers,

Dave

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Re: Pardini .32 ACP Chamber Type? Pic

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