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Partial powder burn?


Aiden
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Hi all,

Yesterday I had my first questionable round during a club practice night. Shooting the stage, hammer falls, gun goes bang but it sounds extremely quiet to me. I stopped immediately.
RO did not hear anything different but most of the peanut gallery agreed it sounded like a squib. Slide was fully forward.

Dropped the mag, racked the slide, and inspected the chamber. Nothing in there but some unburnt powder. RO inserted a zip tie and it cleared the barrel. Shot the stage again with the same batch of ammo with no issues. I cannot recall if it chambered the next round; I dropped the mag and racked the slide on autopilot.

I was shooting a Tanfoglio Stock 2 in 40S&W with a Titan hammer and a PD 15.5lb hammer spring. I'm running Federal SPP with 165gr SNS over 4.1gr N320, loaded to 1.125.
Cases are lubed with Hornady one shot, dry for 5-10 minutes, then I start loading on a Dillon 550. I visually confirm powder drop for each case, and case gauge every round in a Hundo.
Should I blame powder contamination, bad batch of primers, bad primer pockets, or what?

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1 hour ago, Aiden said:

Hi all,

Yesterday I had my first questionable round during a club practice night. Shooting the stage, hammer falls, gun goes bang but it sounds extremely quiet to me. I stopped immediately.
RO did not hear anything different but most of the peanut gallery agreed it sounded like a squib. Slide was fully forward.

Dropped the mag, racked the slide, and inspected the chamber. Nothing in there but some unburnt powder. RO inserted a zip tie and it cleared the barrel. Shot the stage again with the same batch of ammo with no issues. I cannot recall if it chambered the next round; I dropped the mag and racked the slide on autopilot.

I was shooting a Tanfoglio Stock 2 in 40S&W with a Titan hammer and a PD 15.5lb hammer spring. I'm running Federal SPP with 165gr SNS over 4.1gr N320, loaded to 1.125.
Cases are lubed with Hornady one shot, dry for 5-10 minutes, then I start loading on a Dillon 550. I visually confirm powder drop for each case, and case gauge every round in a Hundo.
Should I blame powder contamination, bad batch of primers, bad primer pockets, or what?

Contaminated powder? Maybe

Bad Primer? Not likely with federal

Bad primer pocket? No

My money is on a simple undercharge if anything.

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2 hours ago, Aiden said:

How much unburnt powder might be considered normal? 

 

Would an undercharge leave a lot of it unburnt?

I guess it could. One shot has never hurt any of my powder so possibly something else got in there? Do you wet tumble?

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10 hours ago, Ming the Merciless said:

I would suspect a split/cracked case with a full powder charge.  Low neck tension and a ventilated case equals low pressure, and less noise.

 

Hrmm. I've never had a cracked case make it past case gauge. Wish I had found the brass.

 

18 hours ago, Sarge said:

I guess it could. One shot has never hurt any of my powder so possibly something else got in there? Do you wet tumble?

 

I buy processed range brass, no idea how they clean it. Occasionally I'll find weird stuff in them.

 

I've never had issues with the process when loading major, but changed to Federal primers and loading short for minor the last 1,000 rounds or so. Wondering if it's dumb luck, or if I'm dumb. 

Edited by Aiden
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Too bad you didn't find the empty case. It could've also been a primer either crushed/deformed/seated sideways when seating, lessening the primer flame. Federal SPP are very soft, and can easily get deformed if not seated in straight, or too much seating force is used.

Edited by Postal Bob
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If you wet tumble, I've known many people to not wait long enough before priming, resulting in similar issues, but I think more so dead primers.

My thinking is with such a small charge in a large ish case. If you want to keep the same charge, maybe try Magnum primers, but I prefer using powders that get as close to a compressed load as I can for the velocity I want, and still get a complete burn. I don't like those tiny charges.

Sent from my SM-G975U using Tapatalk

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