9mm round fails the plunk test but works in the barrel

[Ironbar]

OK, so everything is reloaded to exact specs, but it won't seat in the case gauge. However, when dropped in the barrel it falls in with no resistance whatsoever. What gives?

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[DizzyJ]

And here I thought the "plunk" test referred to the round dropping into the chamber of the gun.

 

[Ironbar]

And here I thought the "plunk" test referred to the round dropping into the chamber of the gun.

My bad, but the question still remains.

 

[DizzyJ]

My bad, but the question still remains.

If it drops into the barrel that's what really matters.

 

[Capn Jack]

If the slide closes and it goes bang.

You're golden.

 

[titsonritz]

If the slide closes and it goes bang.

You're golden.

Not necessarily.

 

[CRBMoA]

Not necessarily . I just replaced the barrel on my 9mm because it gauged.397.

It happens.

 

[41mag]

I've had a few 45acp over the years not fit exactly into the chamber gauge by some tiny .0001" while they do fit perfectly into the chamber. No one has ever 'splained that other than to start babbling about 'go-no go' etc & so on. I for one would like to learn the real explanation.

 

[v0lcom13sn0w]

And here I thought the "plunk" test referred to the round dropping into the chamber of the gun.

this

 

[CRBMoA]

At .397, a 9mm round can do this.

 

[Certaindeaf]

At .397, a 9mm round can do this.

View attachment 841694

So that wouldn't have happened had you checked the rounds in a case gauge? Lol

 

[CRBMoA]

They were factory loads. What would I be checking? The rounds were fine. The chamber was over-bored. Am I missing something?

 

[Pepe-lepew]

Simple answer is the chamber it larger than the case gauge.

When loading pistol match ammo I inspect any that fail the case guage for defects. Most of the time it is a burr on the case rim and will fit the gauge with a push. If there is nothing obvious they get thrown in the practice bucket. I only get a small amount of these, less than 2%. If you are getting more than this fail the guage you need to find out what is causing it, improper bullets, over/under crimping, bullet misalignment from improper bullet seater profile, lead shaving from lack of bell.

 

[Pepe-lepew]

So factory ammo, check the case gauge.

 

[CRBMoA]

So factory ammo, check the case gauge.

Pardon my ignorance, 'case gauge'?

 

[Certaindeaf]

They were factory loads. What would I be checking? The rounds were fine. The chamber was over-bored. Am I missing something?

I thought you were saying a case gauge would have been useful. In your case, the opposite was in effect true.

 

[Certaindeaf]

Not necessarily.

View attachment 841693

And a case gauge would have prevented that how? It couldn't have been out of battery because that was stated as a given in the post you quoted/responded to.

 

[titsonritz]

And a case gauge would have prevented that how? It couldn't have been out of battery because that was stated as a given in the post you quoted/responded to.

I didn't say anything about a gauge, I simply stated just because the slide closes and goes bang doesn't necessarily mean "You're golden".

 

[DizzyJ]

I'll just say in over 30 years of reloading pistol and rifle ammo I've never used or felt as though I "needed" a case gauge. I tailor the pistol cartridge to the pistol chamber or cylinder, and the rifle cartridge to the rifle chamber.

Your mileage may vary.

 

[DizzyJ]

I've had a few 45acp over the years not fit exactly into the chamber gauge by some tiny .0001" while they do fit perfectly into the chamber. No one has ever 'splained that other than to start babbling about 'go-no go' etc & so on. I for one would like to learn the real explanation.

The chamber has more generous dimensions than that of the case gauge.