New 360 .357 - firing pin bounce?

[bftx]

Hi all, I purchased a new S&W 360 .357, and noticed when I shoot Hornady 357 JHP 125gr XTP ammo I see dual firing pin strikes. In this case 3 out of 25 rounds.

What may be causing this? I don’t notice this when shooting 38, or Remington UMC 357.

I also notice a dual drag mark on my cylinder in a few locations. What may be causing this? I don’t see any wobble, locations that may be rubbing while dry firing.

Unfortunately I have a few more issues, in hind sight. I probably should have refused transfer.

 

[steelslaver]

Does it always fire when you pull the trigger or does it sometimes not fire. Looks like something might not be right with cylinder stop. Maybe the recoil is causing you to milk the trigger a bit during recoil. when you look at it form the side and dry fire it, do you see anything that could cause the extra forward turn line? Anything rub when you open cylinder and turn it?

 

[bftx]

Does it always fire when you pull the trigger or does it sometimes not fire. Looks like something might not be right with cylinder stop. Maybe the recoil is causing you to milk the trigger a bit during recoil. when you look at it form the side and dry fire it, do you see anything that could cause the extra forward turn line? Anything rub when you open cylinder and turn it?

Yes sir, always goes bang. When I look from the side, and dry fire, there is no wobble/movement, and no high spot where I see that the cylinder is rubbing. Same goes for when I open the cylinder, no wobble anywhere.

 

[armorer951]

From the incidental firing pin mark on the casing, it does look like the cylinder may be coming off of the cylinder stop during recoil. (rotation during recoil - cylinder stop not holding)

If you can, you might want to send S&W these photos and a description of the problem. I would also check the strength and integrity of the cylinder stop spring.

Reference the additional "drag" mark on the cylinder....... I'm wondering if there is a burr at the front edge of the cylinder stop window in the frame? I have seen the ball of the cylinder stop damage the front of the stop slot window in the frame by impacting there during the recoil phase of firing, particularly on the very light weight (scandium) frame magnum revolvers. The cylinder stop tends to move forcibly forward during this extremely heavy recoil.

 

[cjtraining]

It appears to have a turn line front of the cylinder stop notch. I have never seen that on a S&W revolver.???????

 

[michpatriot]

I believe this can happen from slooowly staging the trigger on double action and the cylinder not carrying up to lock..look at the locks detents on the cylinder under a magnifying glass to see if there's any burrs on the edges, also can get crud in the cylinder stop window next to the stop or inside the center hole of the stop.

 

[steelslaver]

But, op says it goes bang every time he pulls the trigger. If it fired out of time why are there 2 marks? If he puled the trigger 6 times one of them would be a click unless during recoil he is sometimes stoking the trigger, which I can see in a real light gun with magnum rounds. I can also see how the gun could come unlocked per Armorer, by why the extra firing pin dent? Maybe the trigger stays pulled, gun quickly comes unlocked, cylinder bounces forward and back, turning a bit and primer slams into firing pin a second time. I find the second turn line interesting. How tight is the cylinder. Any play in it? Strange.

 

[michpatriot]

Under recoil the firing pin is driven back against the hammer..and can bounce back.. especially in these airlites. I own two of these 11.4oz technology stretchers..

 

[bftx]

Gun is headed back to S&W. Will let everyone know what comes of it. Like you, the dual turn line has me stumped. I see no where it could be rubbing.

 

[Collo Rosso]

Sorry to see you having problems. Just picked up a 360 myself and it has been perfect. S&W should make it good.

 

[steelslaver]

Ya, they make my 296, 396 and 325s look heavy. LOL
Got to be brutal with warm 357s. I have 2 airrwieght J frames, but in 38 special. Like to find one in 327 mag