I think you found your calling.
You really need to get some ammo in the 1060's/1070's. Most rifles prefer ammo in these speeds.
The machine marks I'm talking about are not only on the bolt face. They are on the inside of the bolt body/fp cavity & on the fp itself. There were soooooo many machine marks on both it was called "hip hop don't stop" every time I pulled the trigger.
You really should take the bolt down and give it a good cleaning along with looking for wear and putting a marker on it to check uneven wear.
1st shot flier:
More often then not it's a bolt/fp issue. This is why it's important to get the bolt right and tight. Getting the bolt dialed in doesn't hurt accuracy either. After re-working the bolt on that cz luz my groups shrank +/- 40%.
Once you rule out the bolt isn't causing those 1st shot fliers (typically vertical slop/movement) you should take a piece of rubber from an innertube or 3/8" wide rubber band and cut strips 1" long and 3/8" wide. Put them in the stock at the end of the forearm/front end of the stock and tighten your hold down screws to the normal torque setting. If the 1st shot fliers go away you have a bedding issue.
If you think is a lube/fouling issue take a dry patch to the chamber/leade area in the bbl and clean that area and test. If the 1st shot fliers go away or are decreases by doing this get jb bore paste and use it every time you take the rifle out on a patch to the chamber/leade of the bbl. Re-test without cleaning every now and then, after enough polishing with the jb bore paste the 1st shot fliers will go away if this is what's causing them.
A $10 inspection camera from e-bay that works with a cellphone is $$$ well spent. This area of the bbl is where the game is won or lost. A little peak at it every now and then doesn't hurt.
[IMG][/IMG]
If you try all of those things above and you still get 1st shot fliers give the whole bbl a good cleaning. A stripped down bbl typically takes 1 shot per inch of bbl to re-season it. Better highly polished/lapped bbl's take +/- 2" per shot to season the bbl. After cleaning the bbl you still get 1st shot fliers that' telling you the bbl wasn't installed correctly (typically too tight).
If you do decide to take the bolt apart please post some pictures.
Anyway, I'm looking forward to your testing.