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Pardini 32 ACP & 32 S&WL Bore Diameter?

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Post by beeser 1/24/2021, 8:10 am

What are the bore diameters for the new Pardini 32 ACP and 32 S&WL pistols now being shipped?  Are they consistent or will I have to slug the barrels of mine to be sure?

beeser

Posts : 1143
Join date : 2014-06-19

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Post by fc60 1/24/2021, 10:48 am

Greetings,

The current Pardini barrels measure 0.3135"-0.3145" groove diameter.

Choke is applied at the muzzle reducing the groove diameter about 0.002"

Both barrels are identical with the exception of the chamber.

The 32 S&W Long is chambered in Italy.

The 32 ACP is chambered in the USA. It is illegal to chamber 32 ACP in Italy as it is a Military cartridge.

Pardini USA import barrels with no chambers for the 32 ACP models.

I have measured old Pardini HP barrels (0.504" breech diameter) and they gauged at 0.313".

I do not use "slugs" as I have a set of internal gauges that measure +/- 0.0002".

Cheers,

Dave
fc60
fc60

Posts : 1389
Join date : 2011-06-11
Location : South Prairie, WA 98385

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Post by beeser 1/24/2021, 1:09 pm

Thanks Dave!  So, are we supposed to size our bullets based on the nominal groove diameter or at the muzzle?

beeser

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Post by fc60 1/24/2021, 3:12 pm

Greetings,

Bullets need to be sized to fit the rear of the barrel. (0.314")

Cheers,

Dave
fc60
fc60

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Post by beeser 1/24/2021, 3:18 pm

fc60 wrote:Greetings,

Bullets need to be sized to fit the rear of the barrel. (0.314")

Cheers,

Dave
That's what puzzles me.  If .001" over the barrel diameter is used for bullet selection why does the .312" Hornady XTPs work so well?  It seems we should be using a .315" diameter bullet.  I'm confused.

beeser

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