Brent:

I suspect that much of the blame can be put on the ammo. Wolf seems to use very soft brass and so it tends to get real cozy with the chamber walls. Any chamber roughness is going to show up. Also the ammo is a bit dirty. Perhaps it is the lube they use but my rifles will only eject about 50 rounds reliably and then the chamber needs cleaning.  Swabing the chamber with a dry patch occasionally seems to solve this problem without messing with the bore conditioning.

Glenn

This is going to seem a bit "far out". However, I have a S&W Model 41 that was extremely reliable. After several years of use, the cycle of reliability seemed to noticeably deteriorate. In other words, I had to clean it with ever shorter cycles to maintain reliability, then it would start to fail to eject. I examined it carefully and could find nothing that would tend to cause this. I do most of my own maintenance work including some mild gunsmithing but this was evidently beyond my experience and/or ability to solve.

Fortunately, I had access to a Top Line pistol smith (Harold Johnson, a former Marine Gunnery Sgt that smithed the Marines Team guns when the Marines "Owned" Camp Perry). Harold took one look at the pistol and stated that the chamber was leaded up, a not uncommon condition on a pistol that had had thousands of rounds shot through it. He had a special chamber reamer with somewhat dulled lands that easily removed all of the lead without removing any metal from the chamber (Brownell's now offers these). The pistol immediately started working like new again. Active pistol match competitors may find this a common problem.

The lead in the chamber was polished by the cleaning rod until it looked just like the barrel surface. You really could not tell it was leaded up. However, a serious amount of lead was removed from the chamber.

It seems to me that this could also happen with a single shot rifle.

FWIW
Dale53