Thread: Rounds jamming into lands

Originally Posted by T.FOYE

What i see is the lack of cut marks. I think you have a carbon ring that has formed in your chamber throat. When i deliberately extend my projectile fwd i always see little razor like cuts which i dont see in your picks. You are seating way back so i dont think you are hitting the lands at all. I would have that bore inspected / cleaned by a gunsmith

The other thing is that your plastic tip is deformed. That has happened because the seating stem you are using is not the correct profile for the VLDs you are using. If you're using a redding you can just buy the seater stem upgrade for your existing die. Even better get a Forster die.

Is the cut mark on my first pic what you are referring to? Or something different again



Rounds were all single fed. I sorted through all the brass by length and took all the trimmers out and used the brass that havnt needed trimming(anything over 1 thou).

So I've gathered that the main suspect is the Neck sizing stretching the neck and shoulder but I'm concerned what the cut is on the pill in my first photo as some have stated it's definitely not from the lands. I know that it lefr the same cut on the couple of rounds that were tight that I shot right before.

Originally Posted by kayneb

Is the cut mark on my first pic what you are referring to? Or something different again



Rounds were all single fed. I sorted through all the brass by length and took all the trimmers out and used the brass that havnt needed trimming(anything over 1 thou).

So I've gathered that the main suspect is the Neck sizing stretching the neck and shoulder but I'm concerned what the cut is on the pill in my first photo as some have stated it's definitely not from the lands. I know that it lefr the same cut on the couple of rounds that were tight that I shot right before.
Attachment 178652

Greetings again kayneb,
I saved the image and zoomed in to get a better look. There are no scrape marks on the forward side of the gouge. This and the fact you had other rounds with this mark leads me to believe that the gouge did not happen in the chamber. My guess would be that the ejector, Plunger type I assume, drove the cartridge into a rough spot inside the action. A careful feel around inside the front of the ejection port may turn something up. A rough edge would do it.
Regards Grandpamac.