9mm load failed plunk test

[jgp10s]

I just bought new round 9mm Magtech First Defense in 147 gr, which failed the plunk test in my CZ P10s. The cartridge is seen longer than Remington 147 gr. Is it safe for the shooter and handgun (P10-S) to use this load (Magtech). Note that this has CIP marking as recommended in the CZ P-10 Manual.

jgp10s

[Earl Keese]

I just bought new round 9mm Magtech First Defense in 147 gr, which failed the plunk test in my CZ P10s. The cartridge is seen longer than Remington 147 gr. Is it safe for the shooter and handgun (P10-S) to use this load (Magtech). Note that this has CIP marking as recommended in the CZ P-10 Manual.

jgp10s

If it didn't pass the plunk test, use it in another gun.

[jgp10s]

Just like that?
Can somebody provide enlightement as to what could go wrong if the cartridge is fired from a CZ P10s?

Many thanks for the reply....

[tdogg]

If it fails the plunk test, that most likely means the bullet is getting jammed into the lands.  This could lead to a pressure spike when fired that would surpass the originally tested pressure.  Without knowing the load details or velocity maximum for that specific cartridge, it's difficult to say if it's safe or not.

If it fails the plunk test you're most likely going to face feeding issues.  I would steer clear of it and try something else.

Cheers,
Toby

Sent from my SM-G950U using Tapatalk

[SI VIS PACEM PARRABELLUM]

All that has been stated is true. Also a cartridge not seated against the case mouth as intended has an obvious headspace problem and that being true you also you run the risk of case blowouts because the gun is not fully in battery and the case is not properly supported.
Don't use the rounds in your P10-C

[M1A4ME]

If it doesn't properly fit continuing to try to use (anything) is not a good idea.

I won't use tires on my cars/trucks that rub the fenders or the frame (when turning).

I won't try to jam a .45 acp magazine in a .40 S&W mag. pouch (or the other way if the .40 is a double stack and the .45 pouch is for the 1911).

You just learned that something about the combination of that ammo and your pistol isn't correct.  The "correct" choices are 1 - use some different ammo that does fit your chamber, 2 - have the chamber in your pistol reamed to work with the ammo you want to use.

For what it's worth, I have yet to find a 147 grain load that shoots good groups in any of my CZ 9MM pistols.  Even the Winchester 147 grain hollow point factory ammo looks bad on paper at the range.

Good luck with your pistol.  And try some 124 or 115 grain ammo. 

[Wobbly]

Also a cartridge not seated against the case mouth as intended has an obvious headspace problem and that being true you also you run the risk of case blowouts because the gun is not fully in battery and the case is not properly supported.

When the case head blows out, your right hand, arm and eye receive a blast of 30,000 psi metal and gas. Think of it as treating yourself to a miniature grenade.

On top of that, the P10 being a plastic gun won't take the pressure well, so it will also suffer the consequences. As the design tries to route the pressure into the mag well, this happens...

Don't use the rounds in your P10-C

Like he said.

[jgp10s]

Many thanks for all your inputs, find them very helpful....

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[Wobbly]

Many thanks for all your inputs, find them very helpful....

Do you understand the base issue ?



The 147gr is a long bullet. But inside the 9mm Luger cartridge case, the brass gets thicker somewhere behind the bullet. The short freebore of the CZ requires the bullet to be deeply seated, but because of the case wall thickness, there's only so deep you can go.



So, you really need to take your barrel with you when you go ammo shopping.