played with mine for a couple of hours yesterday. Made a small feedramp extension to try to cure the nose diving of a full mag. It didn't work!
The problem with more than 5 rounds in the mag the top round is not supported sufficiently to keep it from tipping forward when the bolt pushes on it. This is caused by too much spring tension when the mag approaches full. As a result the round pivots forward on it's rim and picks up the front of the feed ramp and jams.
It picked up the front of the extension just as easily and it was even with the front of the mag.
Mine feeds great with 5 or less rounds in the mag, so I'll probably try reducing the spring pressure in the mag.
I also started lapping the action to get some kind of smoothness out of it. Got a ways to go on that part of the build, but after one application of coarse lapping compound it is better. So I will continue trying for complete contact of the bolt luggs which will make closing the bolt much easier.
Also deburring the rear of the bare bolt so it rotates in the bolt shroud better is helping cut the drag down. I also radiused the front of the firing pin keeper/sear piece so it would not hang up on the bolt shroud, it works better too, but still not the way I want it. I have several Mauser rifles, and all of them except this one are glass smooth.
This one is like broken glass.
I am also going to cut my firing pin spring for a lighter trigger pull which will make it run smoother as well.
Lots of little tweeks to do on this one to get it nicer. I am still working on the feeding issue, and when that is good I need to work on making a new ejector box and bolt stop.
Randy