Well, here I am again with comments and results with the R-1 Hunter in 10mm.
As I previously stated my problems, I was finally able to adjust the extractor to the proper tension, but only after really modifying it. After all of my work (I will explain what I did), I have come to the conclusion that the original Remington extractor (?) would not/could not work because of its design.
(If you compare their extractor design to all the others, you can see the difference). First of all, the slide slot where the extractor is held in position is out of spec, which positions the extractor too far forward. When I sent the pistol back to Remington, explaining the problem, they did NOT fix it. Their answer was to replace the extractor with the exact original extractor. Anyway, after trying 3 different extractors, I settled on the Ed Brown, and proceeded to modify it. The Brown extractor is of the usual design, with a raised surface in the center where you can bend/form it to adjust the tension on the case. I could not achieve this because it appears that the extractor at the tip was being held away from the case because of the thickness of the extractor. So, with careful use of a small flat file, I removed some of the metal from the extractor, just to the rear of the hook. There is a raised portion just below the hook, and that is where it was removed (It took several times to get the correct thickness. I was then able to adjust the tension on the case rim to proper specifications to hold a loaded round against the face of the slide. The next problem was that the hook was too long, in that it would gouge the case just forward of the extractor, when the pistol was fired. So, I carefully removed a small amount of metal from the front of the hook, reshaping the hook, and finishing it with 600 grit cloth.
I fired the pistol last Wednesday, and it looks like all is well. The fired cases now stay close by (not 20 feet away), the gouged case problem is corrected, and the problem of failure to return to battery was found to be a magazine problem. Actually I have 3 magazines that seem to have problems, 2 of which are Remingtons. On another site there were comments about the slide locking open because the slide latch was being bumped by a loaded round. My pistol did that early on, but I replaced the latch with a Ed Brown version, and corrected that. I put the original slide latch in just to test it again, and it promptly failed, and locked open. So I know that was that problem.
The pistol shoots decently accurate, But I can still beat it with my tuned up Glock 40 MOS.
The loads I shoot are Hornady 180 grain XTP or HAP, with 13.2 grains AA9 at 1276 fps,
or 10.5 grains AA7 at 1196 fps, chronoed with a Labradar.
So I guess I will hang on to the pistol for awhile, and do some more load testing.
BUT, I would not recommend the R-1 hunter LS in 10mm. There are several other pistols that work,
like my Glock 40, but I have an Edge trigger and a KKM barrel, and different recoil spring setup in it.
I like working on pistols, but the Remington has been the most annoying.
But I especially don't like the Remington service, and their response. When I sent the pistol back the 2nd time, they determined that THEIR magazine had a faulty follower, but did not replace it.
I have been a service tech for over 50 years, and I would NEVER have sent the pistol back, with the magazine written on its side with felt pen indicating it had a problem.