What is the plunk test?

[steelholder]

I know it's the typical "if it fits it ships" type of barrel test but when using taller or longer projectiles a cartridge can stick out a little more than a regular ball round. I hope this makes sense, but if the base of a cartridge sticks out a little more from the barrel but the slide still goes into full battery you should* be g2g right? I'm also using a no-go and making sure it flush there.

[cavemanlrrp]

I'm not a gun smith.

If we are talking about a straight wall case, it is supposed head space off the case mouth. Bullet not touching rifling.

If you drop round into chamber and it dose not drop all the way in, case head sticking out of chamber "a little", and then slide goes into batter, it has probably shoved bullet into rifling and or set bullet back into case.

None of these is good. And not gtg.

Dose the round drop back out of chamber? any rifling marks on bullet after it comes out. Measure overall length before and after forced chambering. Dose it get a "little" shorter?

That my two cents. Some one more knowledgeable that I should be along soon.

Best
caveman

[ojisan]

Caveman, you got it right.

[pacrat]

Caveman, you got it right.

+2

With such a round compressed between the breech face and rifling upon firing. Especially if OP is loading to close to top end ammo. He is flirting with "over pressure" conditions that can lead to Kabooms.

Not GTG.

[J-cat]

Caveman, you got it right.

[J-cat]

If you size a lead bullet to closely match the chamber throat, the round won’t pass the plunk test but the slide will go into battery and the bullet will not set back in the case.

[cavemanlrrp]

So are you saying that from what the op described his rounds were just fine and go ahead and shoot them... he's "good to go" ?

He didn't mention sizing lead bullets.
My mistake. As I said " some one more knowledgeable than I should be along soon".

Best
caveman

[ar15barrels]

I know it's the typical "if it fits it ships" type of barrel test but when using taller or longer projectiles a cartridge can stick out a little more than a regular ball round. I hope this makes sense, but if the base of a cartridge sticks out a little more from the barrel but the slide still goes into full battery you should* be g2g right? I'm also using a no-go and making sure it flush there.

The plunk test is to check if ammo is small enough in DIAMETER to fit freely into the chamber and drop back out without having to be pried out.
The plunk test is NOT for headspace or for length.

The "plunk" is the sound that a properly fitting cartridge makes when dropped into a pistol barrel.
Cartridges that are too tight don't make the same sound.
Cartridges that are too tight usually will NOT fall back out when you flip the barrel upside down.

[Mayor McRifle]

https://youtu.be/s80P2j02YnM