Originally Posted by lugerholsterrepair (Post 222513)

I wrote this before I had a cup of coffee..Never mind!

Originally Posted by alanint (Post 222523)

I don't think the extractor would affect anything but the cartridge base, not its rim.

Try this; Take a permanent magic marker and make marks near the rim of a few loaded cartridges at the 12, 3, 6, and 9 positions. Mark one of these lines with an additional "T" for Top and chamber the round making sure that the "T" mark is right a the top position. After firing, see where the shaved area is in relation to your marks. This will help you determine which of the gun's components is acting on the spent shell.

Originally Posted by mrerick (Post 222524)

What does the breech throat area of your barrel look like?

Marc

Originally Posted by Rick W. (Post 222520)

I am not overly sure of what is causing the marks on the case from here.

Likewise, I am not overly sure, how brass will mar steel but I do not get out much.

The extractor that resides in the breechblock only has so much reach up the case, wants to run over the rim and lock into the rim recess of the case during charging. If the brass shavings are coming from there, looks like the rims would show the wear(scratches at least).

One might take a small file and mark the rim with a smallish cut, then put that cut straight up before firing in single shot mode. That way you would have an angular reference as a clue.

I reckon it is possible for the fired case to be marked by the sharp edge(taper crimp) of the next round in the magazine, and possibly by the ejector. Just a guess on my part. Perhaps the ejector is kicking the spent case hard to the left onto the receiver fork?

The 9mmx19 is a slightly tapererd rimless case that headspaces on the case mouth. The original crimps in reloading were so called rolled crimps, such that the front of the case mouth was actually rolled into the bullet by the crimping/seating die. The taper crimp dies actually compress the case around the bullet completely, kinda a complete squeeze, rather than just at the case mouth.

It is easy to overdo the roll crimp and effect headspace, lots of leverage in today's presses. The taper crimp can be overdone too, but a bit harder to do because of dimensional stops, but leaves a nice squarish face to headspace on. Most that do the roll crimp on these cases use only a smallish amount of roll, and the headspace is off the very slightly rolled edge. Both methods will work nicely, appropriately applied.

One finds the roll crimp moreso in the rimmed cases.

One has to have to have some crimp, from whatever type of method, just to keep the bullet from going down the case and reducing the powder cavity(higher pressures). One might note that an overly smallish expander can provide fair amount of bullet holding power on its own but can effect accuracy especially with lead bullets(lead shaving on seating).

The holdopen deal can be a puzzler at times. The spring on the holdopen tries to keep the face of the holdopen in its cavity at all times. If the holdopen lead spring is weak, then the holdopen can bounce upward and catch the breechblock early. If so, one would think that the holdopen issue would show up somewhat randomly with reference to the number of cartridges still in the magazine.

The other issue is in the magazine itself. How high does the new magazines sit in the frame. The other is the size of the magazine loading button on the side, ie diameter of said button.

One can take the one grip off and watch the things work on the holdopen versus the magazine button. The purpose of the button is to mechanically lift the holdopen up against the will of the hold open spring to catch the breechblock appropriately.

I notice some wear on the ramps; may just be the picture.

Originally Posted by alanint (Post 222566)

What is that "U" shaped piece at the top of your extractor groove? That does not belong there!?!
Please take a photo of this area from the top of the pistol looking down. This right here may be your problem.

Originally Posted by Lugerdoc (Post 222577)

Unually when the case mouth of a spent case is crushed, it's a result of the toggle returning faster than the case can eject. There are several possible cause of this, but with the lack of HO after the last round, I would postulate that the recoil spring is too strong for the ammo being used. Cutting a link or two off of the current recoil spring, should solve this problem. Of course it would be a good idea to also check the condition of the extractor and ejector, which can also delay case removal. TH

Originally Posted by Vlim (Post 222580)

Take a look at the extractor spring (the little coil spring below the extractor itself). When it is weak, the round will be pulled backwards, and rammed out by the next round. The dent is usually caused by the extracted case banging into the receiver. You should notice that the case barely clears the gun while shooting. With a fresh extractor spring, the case will jump over you.

I had a mismatched VoPo with the same 'features'. The cases kept hitting me in the face, or on top of my head, and all were dented. Finally I replaced the extractor spring and all went back to normal.

Originally Posted by JD (Post 222585)

Looking at your photos, and noting that you are using WWB, I don't think the "brass" you are seeing in the pistol action is brass at all. WWB is loaded with ball powder, and in my experience it leaves some unburnt powder particles in the action after firing. These particles are a yellow / brass color as the deterent coating gets burned off, and are very small spheres or flattened spheres. To the average shooter they do appear to be "brass" particles, but instead are simply unburnt pwder particles and are quite normal when firing ammo loaded with some types of ball powder. I see this all the time when firing my Sigs with Winchester ammo...

Originally Posted by mrerick (Post 222597)

It looks like the barrel is not rotationally aligned in the receiver. Note the lack of symmetry at the extractor cut.

Note how the left side of the cut is vertically aligned, and the right side of the cut has a step.

Does the barrel witness mark line up, and is the front sight perfectly vertical to the receiver and frame?

Marc

Originally Posted by JD (Post 222697)

Sky Zero,

Unburnt powder particles can look shiny if they are covered in oil or when you shine a bright light on them. Powder particles are round or semi-round flattened spheres, often very small. Powder particles would not be in the shape of strips, or rectangles. My guess is that most of what your seeing is powder particles, with probably some real brass particles thrown in too...