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  1. Rubicon Precision

    Gunsmithing Barrel runout question

    There’s way too many variables to calculate this. Every barrel is different. Depending on how the barrel is held in the lathe, it may be being bent between chucks/spiders to force a reeding that may not be reality in the free state. Working between chucks/spiders, one may think they have .040”...
  2. Rubicon Precision

    Gunsmithing Barrel runout question

    If you read the internet, one would think the bore would run out a few inches because these barrel makers have no idea how to gun drill a deep hole…
  3. Rubicon Precision

    Action receiver/barrel thread length

    Regarding that K31 shank pictures above, that follows pretty much my thoughts. BUT, I think it would need to be a light interference fit or greater for it to make a real “RTZ”. The fit would need to be interference, yet be allowed to be assembled/disassembled with the threaded portion. My...
  4. Rubicon Precision

    To thread or not to thread?

    Finally someone that shoots as much as I do! But in all seriousness, threading ihe muzzle should not decrease the accuracy. May even increase it if a new crown is cut.
  5. Rubicon Precision

    Action receiver/barrel thread length

    I know this is an old thread, but I came across it google searching for something else. Regarding that stress analysis above, I would assume that is based on the fastener being tensioned to about 80% of the yield strength. I am curious what the analysis would look like with a typical barrel...
  6. Rubicon Precision

    Rechambering?

    Throw it in the gutter and go buy another.
  7. Rubicon Precision

    Issue with throat depth

    Like Mr. Cross said, it’s likely a worn reamer resulting in a freebore diameter smaller than the bullet. I find it hard to believe a builder would use a reamer spec’d with a freebore that won’t chamber factory FGMM unless specifically requested. Either way, I’d expect the builder to resolve it...
  8. Rubicon Precision

    Gunsmithing Barrel thread and shoulder machining?

    That is some bullshit. No, that is NOT how threads come out sometimes if you are doing it right. That is a set-up and tooling problem, not a material problem.
  9. Rubicon Precision

    Gunsmithing How do you cut this angle.

    On a manual lathe, a boring bar can be used for the chamber pre-bore (if you’re into that sort of thing), counterbore, counterbore chamfer, chamber chamfer/edge break, and then run your spindle in reverse and chamfer the OD on the backside. One tool, one compound setup.
  10. Rubicon Precision

    Barrel threaded length

    Double check your die diameter as stated in the OP!
  11. Rubicon Precision

    Barrel threaded length

    Thread the die on until it hard stops. Give it four more turns, bam, .200” more threads than were there before.
  12. Rubicon Precision

    Barrel threaded length

    He’s got 1.3” of established thread. I fail to see how adding an additional .200 of threads with a die is going to hurt anything. Hell, it would probably be more accurate than someone trying to dial the existing threads dead nuts in a lathe and chasing them. Now the why part, that’s up to him.
  13. Rubicon Precision

    Zealot Rifle Chassis by KMW

    A very well thought out and designed chassis from the maker of the best looking stock (Sentinel) out there. Can’t wait to see what the comp version brings!
  14. Rubicon Precision

    Stainless Barrel Bore-Scope Discovery

    Or some of us look at hundreds of barrels a year with a bore scope and understand what may look a bit sketchy under high magnification, and a potentially distorted view, very well could be completely insignificant on target.
  15. Rubicon Precision

    Stainless Barrel Bore-Scope Discovery

    It absolutely amazes me how well rifles shot before Chinese borescopes were in every shooters hands….
  16. Rubicon Precision

    Bolt not closing on 6bra go gauge

    Run it.
  17. Rubicon Precision

    Help with muzzle threads on a expensive custom barrel

    The The major diameter was machines too small. But it’s pretty apparent, even to the naked eye. Even if a shop doesn’t gauge every thread on a proven program, that one is hard to miss visually.
  18. Rubicon Precision

    Help with muzzle threads on a expensive custom barrel

    The builder hasn’t even been made aware of the issue, nor been given the opportunity to correct it. Probably no need to toss the builder under the bus at this point.
  19. Rubicon Precision

    Help with muzzle threads on a expensive custom barrel

    Don’t waste any more time worrying about the pitch diameter. The major diameter is .012”-.013” under spec. Send it back for a replacement.
  20. Rubicon Precision

    Prefit Barrel Won't Screw onto Action

    Why is it easy to set up If you could get it EXACTLY where you wanted it the first time, I am still failing to see how you couldn't get it right back there? And the thread profile and pitch is not changing not changing. Taking a few+ thousands of pitch off in a second set-up should look...
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