Its as I figured, I think. The screw bottomed out before the head came in contact with the mount. That's a bummer of a way to find out. Just to make sure can you dig around with a dental tool or tooth pick and see if you can find the bottom of the hole just to make sure it doesn't already come through. However, I never heard of as screw twisting off well down into the threads. Its usually happens right at the head??????
RE: Jim Hall. Know nothing about his work. The real problem is getting the remaining portion of the screw out of the hole. The remaining portion will be fairly tight, hence the twist off. I don't know if an easy out can be had that small. Talk to Ski(John) at Ski's he may give a recommendation on Jim.
Another candidate, who does good work, but is slower that Moses' goat, i.e., you may get it back before next season, maybe, is the fella in Rexburg, across the street from BMC. Bruce something or an other. He's done some barrel exchanging and brake installation for me and has done an outstanding job but it took 10 months when originally 10 days were promised.:mad:
If I were in your situation I'd send it to Kirby. He's pretty nice about those kinds of things.
Any "good" machinist could do the job. but everything needs to be lined up perfectly to "drill out" the remain portion without damaging existing threads. I also don't know if there is any harm in completing the hole????? It would depend if it is behind the barrel shank threads.
Regarding three tight screws and one loose screw: I doubt this would cause your accuracy problems.
Regarding bedding: I'd check it with a dial indicator mounted on the barrel and the indicator riding on the forearm. Alternately loosen and tighten both mounting screws. If movement is excessive then you may have found your problem. If it appears a problem then I'd pillar and skim bed. You could do this yourself with a little coaching, just for confidence, and you would be in control of the schedule.
Originally Posted by 300winnie
Sorry I didn't really answer any of your questions earlier, but now I have some time so I will describe.
It appears that it is a blind hole...at least the front hole on the front mount is. I assume the back one will be as well as it would come out in one of the lug recesses.
When I tried to turn each screw in the mounts and rings I didn't get any play until I got to the alleged screw. It turned like it wasn't tight so I thought I would back everything out (only had three mount screws left to do) and reset everything with loc tite. It backed out just fine and felt normal. It wasn't until I looked at the hole that the light went on...I thought there is no way that little amount of threading is going to do anything...then I looked at the screw...sure enough sheared off with the bottom part still in the receiver.
As far as this causing my accuracy problems...what is your honest opinion? If the front screw was tight, and both screws in the back mount were tight am I going to get that much play to throw my groups around like they have been?
Haven't heard good or bad about Jim Hall's work. How is it? I think I would like to get the action and recoil lug bedded while he has it. Is that where you would send it, or do you have other suggestions?