Luger jams shut?

[Ktm4]

Hey guys,

I'm tinkering with a Luger and notice when I put dummy rounds through it, every once and a while, probably once or twice in a mag, the bolt jams shut. I need to take a rubber hammer to it to open it back up. Any idea what this may be?

I have not shot this pistol, I had to replace the firing pin. I cleaned the chamber and the gun looks like it is in great condition.

I'm stumped, once again.

 

[rcmodel]

Oversize dummy rounds?

With the bolt locked open.
Try dropping one that sticks in the chamber and see if it fits

Rc

 

[Ktm4]

Thanks rc, I gave that a go and they all seem to be running fine now. Maybe it just hasn't been cycled in a long time? One other thing is that the rounds occasionally jam up with the nose of the bullet right under the extractor groove.

I wish I was more familiar with these neat pistols but I never had the opportunity to play with them before.

 

[rcmodel]

What kind of ammo / bullet shape are you trying to use?

The original German load used a 124 grain FMJ bullet.
At first, a truncated cone shape, then later a round nose.

They should be approximately 1.160" long OAL.

Shorter JHP or flat point ammo very likely will not feed.

rc

 

[Ktm4]

I'm using the caps from A- Zoom, they're reading about 1.108" in OAL. FMJ round nose. Is the Luger just tricky to simulate running dummy rounds through it, and may work when live firing?

 

[Jim Watson]

ANY automatic can be deceptive when manually cycled.
And snap caps are not the same as dummy rounds, either.

Shoot the gun and call back in the morning.

 

[Ktm4]

Yes, my mistake, they are snap caps, not dummy rounds. I always flop those two around.