What are these marks?

[Iamjustifyd]

What are these marks from? I went to the range yesterday and was cleaning today, don't remember these being there.

 

[franch1se82]

take a pic of the cylinder

 

[pullstart]

Looks like an aluminum frame revolver and the casings are indenting the reciever. Do you keep your brass? Did you notice any spent brass with a problem?

 

[Iamjustifyd]

Had a couple of misfires, I think the primers were not seated all the way. Probably from that?

 

[scooterj]

How light were the loads? Very light loads do not create enough pressure to make the primers seal and allow gasses to escape from the flash hole/primer pocket. Those gasses will erode the breech face.

 

[Richard in LA]

Was it steel cased ammo? I read somewhere about a 642 that had craters around the firing pin bushing after firing polymer coated steel cased ammo, and smith ended up replacing it.

 

[Iamjustifyd]

It's a S&W 642 J frame, 158 gr SWC with 4.2gr Unique powder. Brass casings, CCI primers

 

[JR1572]

I just checked my 442. Mine doesn't have any of those symptoms.

JR1572

 

[Iamjustifyd]

Do ya'll think I could leave it and see how it does or get in touch with S&W?

 

[themcfarland]

if there is metal missing, or if you can run your fingernail over it and feel it? I would call and see.. if its just cosmetic... your call

 

[Richard in LA]

I would contact smith and NONE of these words would come out of my mouth; "reloads, hand loads, remanufactured, 4.2 grns unique," etc.....
Worse thing that could happen is they do nothing. My 642 has some small dimples in the finish around the firing pin bushing, but looks nothing like yours.

 

[leeshall]

Looks to me like either a primer or case failure at the outside edge of the primer pocket. Either way the result is the same - hot, high pressure gas escaping at the edge of the primer pocket. The hot gas escaping acts like a cutting torch & cuts away the metal. The softer metal of the alloy frame got the worst of it. Check all your fired cases from the shooting session that resulted in the damage.

 

[barbarossa]

Not good is what they are. Not good at all.

Gas erosion.

 

[Cajun Camper]

Looks like erosion, may be gas or gas & particles of un-burnt powder possibly.

 

[Iamjustifyd]

Just got a call from S&W, they received the gun about a week ago and they are sending me a new one!!

 

[Ferrara Fire]

That is the reason why the first thing I look at on a used gun is the breech face...